SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------
                                  SCHEDULE 13G
                                 (Rule 13d-102)

        INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES
               13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED

                             PURSUANT TO RULE 13d-2

                                (Amendment No.)*

                           Dynavax Technologies Corp.
                                (Name of Issuer)

                    Common Stock, $.001 Par Value Per Share
                         (Title of Class of Securities)


                                   268158102
                                 (CUSIP Number)


                               November 13, 2012
            (Date of Event Which Requires Filing of this Statement)


   Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

     [ ]  Rule 13d-1(b)
     [x]  Rule 13d-1(c)
     [ ]  Rule 13d-1(d)





                              (Page 1 of 18 Pages)
---------------
      *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

      The information required in the remainder of this cover page shall not be
deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act
of 1934 ("Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).


CUSIP No.268158102                13G                Page 2 of 18 Pages


--------------------------------------------------------------------------------

      (1)   NAMES OF REPORTING PERSONS
            HealthCor Management, L.P.

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]

--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    16,400,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    16,400,000
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            16,400,000
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            9.18%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            PN
--------------------------------------------------------------------------------


CUSIP No. 268158102                13G                Page 3 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Associates, LLC

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    16,400,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    16,400,000
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            16,400,000
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            9.18%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            OO - limited liability company
--------------------------------------------------------------------------------


CUSIP No. 268158102                13G                Page 4 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Offshore Master Fund, L.P.

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Cayman Islands
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    14,872,486
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    14,872,486
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            14,872,486
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            8.32%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            PN
--------------------------------------------------------------------------------


CUSIP No. 268158102                13G                Page 5 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Offshore GP, LLC

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]

--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    14,872,486
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    14,872,486
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            14,872,486
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            8.32%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            OO - limited liability company
--------------------------------------------------------------------------------


CUSIP No. 268158102                13G                Page 6 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Hybrid Offshore Master Fund, L.P.

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Cayman Islands
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    702,514
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    702,514
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            702,514
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            0.39%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            PN
--------------------------------------------------------------------------------

CUSIP No. 268158102                13G                Page 7 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Hybrid Offshore GP, LLC

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    702,514
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    702,514
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            702,514
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            0.39%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            OO - limited liability company
--------------------------------------------------------------------------------

CUSIP No. 268158102                13G                Page 8 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Group, LLC

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    16,400,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    16,400,000
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            16,400,000
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            9.18%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            OO - limited liability company
--------------------------------------------------------------------------------

CUSIP No. 268158102                13G                Page 9 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            Arthur Cohen

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            United States
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    16,400,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    16,400,000
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            16,400,000
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            9.18%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            IN
--------------------------------------------------------------------------------

CUSIP No. 268158102                13G                Page 10 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            Joseph Healey

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            United States
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    16,400,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    16,400,000
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            16,400,000
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            9.18%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            IN
--------------------------------------------------------------------------------

CUSIP No. 268158102                13G                Page 11 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Long Offshore Master Fund, L.P.

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    825,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    825,000
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            825,000
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            0.46%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            PN
--------------------------------------------------------------------------------


CUSIP No. 268158102                13G                Page 12 of 18 Pages


--------------------------------------------------------------------------------
      (1)   NAMES OF REPORTING PERSONS
            HealthCor Long Master GP, LLC

--------------------------------------------------------------------------------
      (2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                          (see instructions)
                                                                      (a) [X]
                                                                      (b) [ ]
--------------------------------------------------------------------------------
      (3)   SEC USE ONLY
--------------------------------------------------------------------------------
      (4)   CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware
--------------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER

                    0

SHARES         -----------------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    825,000
OWNED BY       -----------------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0

REPORTING      -----------------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    825,000
--------------------------------------------------------------------------------
      (9)   AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
            825,000
--------------------------------------------------------------------------------
      (10)  CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES(see instructions)          [ ]
--------------------------------------------------------------------------------
      (11)  PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
            0.46%
--------------------------------------------------------------------------------
      (12)  TYPE OF REPORTING PERSON (see instructions)
            OO - limited company
--------------------------------------------------------------------------------


CUSIP No. 268158102                13G                 Page 13 of 18 Pages


Item 1(a).        Name of Issuer:
                  Dynavax Technologies Corp.

Item 1(b).        Address of Issuer's Principal Executive Offices:
                  2929 Seventh Street, Suite 100, Berkeley, CA 94710

Item 2(a, b, c).  Name of Person Filing:

                  (i) HealthCor Management, L.P., a Delaware limited
                  partnership, Carnegie Hall Tower, 152 West 57th Street, 43rd
                  Floor, New York, New York 10019;

                  (ii) HealthCor Associates, LLC, a Delaware limited liability
                  company, Carnegie Hall Tower, 152 West 57th Street, 43rd
                  Floor, New York, New York 10019;

                  (iii) HealthCor Offshore Master Fund, L.P., a Cayman Islands
                  limited partnership, Carnegie Hall Tower, 152 West 57th
                  Street, 43rd Floor, New York, New York 10019;

                  (iv) HealthCor Offshore GP, LLC, a Delaware limited liability
                  company, Carnegie Hall Tower, 152 West 57th Street, 43rd
                  Floor, New York, New York 10019;

                  (v) HealthCor Hybrid Offshore Master Fund, L.P., a Cayman
                  Islands limited partnership, Carnegie Hall Tower, 152 West
                  57th Street, 43rd Floor, New York, New York 10019;

                  (vi) HealthCor Hybrid Offshore GP, LLC, a Delaware limited
                  liability company, Carnegie Hall Tower, 152 West 57th Street,
                  43rd Floor, New York, New York 10019;

                  (vii) HealthCor Group, LLC, a Delaware limited liability
                  company, Carnegie Hall Tower, 152 West 57th Street, 43rd
                  Floor, New York, New York 10019;

                  (viii) Joseph Healey, Carnegie Hall Tower, 152 West 57th
                  Street, 43rd Floor, New York, New York 10019;

                  (ix) Arthur Cohen, 12 South Main Street, #203 Norwalk, Ct
                  06854;

                  (x) HealthCor Long Offshore Master Fund, L.P., a Cayman
                  Islands limited partnership, Carnegie Hall Tower, 152 West
                  57th Street, 43rd Floor, New York, New York 10019; and

                  (xi) HealthCor Long Master GP, LLC., a Delaware limited
                  liability company, Carnegie Hall Tower, 152 West 57th Street,
                  43rd Floor, New York, New York 10019.

                  Both Mr. Healey and Mr. Cohen are United States citizens.

                  The persons at (i) through (xi) above are collectively
                  referred to herein as the "Reporting Persons".


CUSIP No. 268158102                13G                 Page 14 of 18 Pages





Item 2(d).        Title of Class of Securities: Common Stock, $.001 Par Value
                  Per Share(the "Common Stock")

Item 2(e).        CUSIP Number:  268158102

Item 3.           Not applicable.

Item 4.           Ownership.

                  The information required by Items 4(a) - (c) is set forth in
                  Rows 5 - 11 of the cover page for each Reporting Person hereto
                  and is incorporated herein by reference for each such
                  Reporting Person.

                  Collectively, HealthCor Offshore Master Fund, L.P., HealthCor
                  Hybrid Offshore Master Fund, L.P., and HealthCor Long Offshore
                  Master Fund, L.P. (each a "Fund" and together, the "Funds")
                  are the beneficial owners of a total of 16,400,000 shares of
                  the Common Stock of the Issuer.

                  HealthCor Offshore GP, LLC is the general partner of HealthCor
                  Offshore Master Fund, L.P. Accordingly, HealthCor Offshore GP,
                  LLC may be deemed to beneficially own the shares of Common
                  Stock that are beneficially owned by HealthCor Offshore Master
                  Fund, L.P. HealthCor Group, LLC is the general partner of
                  HealthCor Offshore GP, LLC and, therefore, may be deemed to
                  beneficially own the shares of Common Stock that are
                  beneficially owned by HealthCor Offshore Master Fund, L.P.

                  HealthCor Hybrid Offshore GP, LLC is the general partner of
                  HealthCor Hybrid Offshore Master Fund, L.P. Accordingly,
                  HealthCor Hybrid Offshore GP, LLC may be deemed to
                  beneficially own the shares of Common Stock that are
                  beneficially owned by HealthCor Hybrid Offshore Master Fund,
                  L.P. HealthCor Group, LLC is the general partner of HealthCor
                  Hybrid Offshore GP, LLC and, therefore, may be deemed to
                  beneficially own the shares of Common Stock that are
                  beneficially owned by HealthCor Hybrid Offshore Master Fund,
                  L.P.


CUSIP No. 268158102                13G                Page 15 of 18 Pages

                  HealthCor Long Master GP, LLC is the general partner of
                  HealthCor Long Offshore Master Fund, L.P. Accordingly,
                  HealthCor Long Master GP, LLC may be deemed to beneficially
                  own the shares of Common Stock that are beneficially owned by
                  HealthCor Long Offshore Master Fund, L.P. HealthCor Group, LLC
                  is the general partner of HealthCor Long Master GP, LLC and,
                  therefore, may be deemed to beneficially own the shares of
                  Common Stock that are beneficially owned by HealthCor Long
                  Offshore Master Fund, L.P.

                  By virtue of its position as the investment manager of the
                  Funds, HealthCor Management, L.P. may be deemed a beneficial
                  owner of all the shares of Common Stock owned by the Funds.
                  HealthCor Associates, LLC is the general partner of HealthCor
                  Management, L.P. and thus may also be deemed to beneficially
                  own the shares of Common Stock that are beneficially owned by
                  the Funds.

                  As the Managers of HealthCor Associates, LLC, Arthur Cohen and
                  Joseph Healey exercise both voting and investment power with
                  respect to the shares of Common Stock reported herein, and
                  therefore each may be deemed a beneficial owner of such Common
                  Stock.

                  Each of the Reporting Persons hereby disclaims any beneficial
                  ownership of any such shares of Common Stock in excess of
                  their actual pecuniary interest therein.

Item 5.           Ownership of Five Percent or Less of a Class:

                  If this statement is being filed to report the fact that as of
                  the date hereof the reporting person has ceased to be the
                  beneficial owner of more than five percent of the class of
                  securities, check the following [ ].

Item 6.
                  Ownership of More than Five Percent on Behalf of Another
                  Person.
                  Not Applicable

Item 7.           Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported on by the Parent Holding
                  Company.
                  Not Applicable

Item 8.           Identification and Classification of Members of the Group. See
                  Exhibit I.


CUSIP No. 268158102                13G                Page 16 of 18 Pages


Item 9.           Notice of Dissolution of Group.
                  Not Applicable


Item 10.          Certification.

                  By signing below I certify that, to the best of my knowledge
                  and belief, the securities referred to above were not acquired
                  and are not held for the purpose of or with the effect of
                  changing or influencing the control of the issuer of the
                  securities and were not acquired and are not held in
                  connection with or as a participant in any transaction having
                  that purpose or effect.

Exhibits:

Exhibit I: Joint Acquisition Statement, dated as of November 21, 2012.


CUSIP No. 268158102                13G                Page 17 of 18 Pages

                                 SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

DATED:  November 21, 2012

                  HEALTHCOR MANAGEMENT, L.P.

                              By: HealthCor Associates, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel


                  HEALTHCOR OFFSHORE GP, LLC, for itself and as general partner
                  of behalf of HEALTHCOR OFFSHORE MASTER FUND, L.P.

                              By: HealthCor Group, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel

                  HEALTHCOR HYBRID OFFSHORE GP, LLC, for itself and as general
                  partner of behalf of HEALTHCOR HYBRID OFFSHORE MASTER FUND,
                  L.P.

                              By: HealthCor Group, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel







CUSIP No. 268158102                13G                Page 18 of 18 Pages



                  HEALTHCOR LONG MASTER GP, LLC, for itself and as general
                  partner of behalf of HEALTHCOR LONG OFFSHORE MASTER FUND, L.P.

                              By: HealthCor Group, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel


                  HEALTHCOR ASSOCIATES, LLC

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel

                  HEALTHCOR GROUP, LLC

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel

                  JOSEPH HEALEY, Individually

                              /s/ Joseph Healey
                              -------------------------------------

                  ARTHUR COHEN, Individually

                              /s/ Arthur Cohen
                              -------------------------------------

                                   EXHIBIT 1

                  JOINT ACQUISITION STATEMENT PURSUANT TO RULE
                                    13d-1(k)

      The undersigned acknowledge and agree that the foregoing statement on
Schedule 13G is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13G shall be filed on behalf
of each of the undersigned without the necessity of filing additional joint
acquisition statements. The undersigned acknowledge that each shall be
responsible for the timely filing of such amendments, and for the completeness
and accuracy of the information concerning him or it contained therein, but
shall not be responsible for the completeness and accuracy of the information
concerning the others, except to the extent that he or it knows or has reason to
believe that such information is inaccurate.

Dated: November 21, 2012

                  HEALTHCOR MANAGEMENT, L.P.

                              By: HealthCor Associates, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel

                  HEALTHCOR OFFSHORE GP, LLC, for itself and as general partner
                  of behalf of HEALTHCOR OFFSHORE MASTER FUND, L.P.

                              By: HealthCor Group, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel

                  HEALTHCOR HYBRID OFFSHORE GP, LLC, for itself and as general
                  partner of behalf of HEALTHCOR HYBRID OFFSHORE MASTER FUND,
                  L.P.

                              By: HealthCor Group, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name:  John H. Coghlin
                              Title:  General Counsel




                  HEALTHCOR LONG MASTER GP, LLC, for itself and as general
                  partner of behalf of HEALTHCOR LONG OFFSHORE MASTER FUND, L.P.

                              By: HealthCor Group, LLC, its general partner

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel


                  HEALTHCOR ASSOCIATES, LLC

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel

                  HEALTHCOR GROUP, LLC

                              By: /s/ John H. Coghlin
                              -------------------------------------
                              Name: John H. Coghlin
                              Title: General Counsel

                  JOSEPH HEALEY, Individually

                              /s/ Joseph Healey
                              -------------------------------------

                  ARTHUR COHEN, Individually
                              /s/ Arthur Cohen
                              -------------------------------------