Document:

<PAGE>

                                                                   EXHIBIT 10.31

THESE SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"). SUCH
SECURITIES MAY NOT BE OFFERED OR SOLD OR TRANSFERRED IN THE UNITED STATES OR TO
U.S. PERSONS IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION THEREFROM UNDER
THE SECURITIES ACT WHICH, EXCEPT IN THE CASE OF AN EXEMPTION PURSUANT TO (A)
RULE 144 UNDER THE SECURITIES ACT, OR (B) REGULATION S PROMULGATED UNDER THE
SECURITIES ACT, IS CONFIRMED IN A LEGAL OPINION SATISFACTORY TO THE COMPANY.

Warrant No. L-_____                                         Date:   May 11, 2001
                                         Warrant Expiration Date:   May 11, 2004

                         CLASS L STOCK PURCHASE WARRANT
                      TO PURCHASE SHARES OF COMMON STOCK OF
                       VOICE MOBILITY INTERNATIONAL, INC.

     THIS CLASS L STOCK PURCHASE WARRANT (this "WARRANT") certifies that, for
value received, ________________ (the "INVESTOR"), is entitled, upon the terms
and subject to the conditions hereinafter set forth, at any time after the date
hereof and on or prior to May 11, 2004 (the "TERMINATION DATE"), but not
thereafter, to subscribe for and purchase from VOICE MOBILITY INTERNATIONAL,
INC., a Nevada corporation (the "COMPANY"), _________ shares of Common Stock
(the "WARRANT SHARES") on the terms and at the Exercise Price set forth below.
This Warrant is being issued in connection with the Nonnegotiable Promissory
Note (the "NOTE"), dated as of even date herewith, made by the Company in favor
of the Investor, and is subject to the terms of the Note.

     The purchase price of one share of Common Stock (the "EXERCISE PRICE")
under this Warrant shall be shall be One Dollar and Fifty Cents (US$1.50). The
Exercise Price and the number of shares for which the Warrant is exercisable
shall be subject to adjustment as provided herein.

     1.   TITLE OF WARRANT. This Warrant shall be issued in the name of the
Investor. This Warrant is not transferable.

     2.   AUTHORIZATION OF SHARES. The Company covenants that all shares of
Common Stock which may be issued upon the exercise of rights represented by this
Warrant will, upon exercise of the rights represented by this Warrant and
payment in full of the Exercise Price, be duly authorized, validly issued, fully
paid and nonassessable and free from all taxes, liens and charges in respect of
the issue thereof (other than taxes in respect of any transfer occurring
contemporaneously with such issue).

     3.   EXERCISE OF WARRANT. This Warrant may not be exercised in the United
States or by or on behalf of a U.S. person unless it has been registered under
the Securities Act of 1933, as

                                       1
<PAGE>

amended (the "SECURITIES ACT"), and any applicable State securities laws, or
unless an exemption from such registration requirements is available. Exercise
of the purchase rights represented by this Warrant may be made at any time or
times one day after the date hereof, in whole or in part, before the close of
business on the Termination Date by the surrender of this Warrant and the Notice
of Exercise annexed hereto duly executed, at the office of the Company (or such
other office or agency of the Company as it may designate by notice in writing
to the Investor at the address of the Investor appearing on the books of the
Company) and upon payment of the Exercise Price of the shares thereby purchased;
whereupon the Investor shall be entitled to receive a certificate for the number
of shares of Common Stock so purchased. Certificates for shares purchased
hereunder shall be delivered to the Investor within five (5) business days after
the date on which this Warrant shall have been exercised as aforesaid. Payment
of the Exercise Price of the shares may be by certified check or cashier's check
or by wire transfer to an account designated by the Company in an amount equal
to the Exercise Price multiplied by the number of shares being purchased.

     4.   NO FRACTIONAL SHARES OR SCRIP. No fractional shares or scrip
representing fractional shares shall be issued upon the exercise of this
Warrant.

     5.   CHARGES, TAXES AND EXPENSES. Issuance of certificates for shares of
Common Stock upon the exercise of this Warrant shall be made without charge to
the Investor for any issue or transfer tax or other incidental expense in
respect of the issuance of such certificate, all of which taxes and expenses
shall be paid by the Company, and such certificates shall be issued in the name
of the Investor.

     6.   RESTRICTIONS ON TRANSFER OF WARRANT SHARES.

          (a)  Investor hereby agrees that Investor shall sell not, transfer,
assign or distribute, either directly or indirectly, any of the Warrant Shares
other than in accordance with and pursuant to the Securities Act and any
exemptions from registration thereunder, including without limitation, Rule 144
or Regulation S. Notwithstanding the foregoing, Investor agrees that Investor
will not transfer, assign or distribute, either directly or indirectly, any of
the Warrant Shares pursuant to an exemption from registration under the
Securities Act and any applicable State securities laws unless all appropriate
action necessary for compliance with such exemption (including Rule 144
promulgated under the Securities Act) shall have been taken. Any transferee of
the Warrant Shares must agree in writing to comply with the provisions of this
Section 6(a) with respect to any resale or other disposition of such securities.

          (b)  The Company shall not be required to: (i) transfer on its books
any Warrant Shares that have been sold, transferred, assigned or distributed in
violation of the provisions of Section 6(a), or (ii) treat as the owner of the
Warrant Shares, or otherwise to accord voting or dividend rights to, any
transferee to whom Warrant Shares have been transferred in contravention of this
Agreement.

          (c)  Unless the Warrant Shares have been registered under the
Securities Act, or are exempt from registration, upon exercise of the Warrant or
any portion thereof and the issuance of any Warrant Shares, all certificates
representing Warrant Shares shall bear on the face thereof substantially the
following legend:

                                       2
<PAGE>

          THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR
          INVESTMENT AND HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE
          UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
          ACT"), OR UNDER SECURITIES LAWS OF ANY STATE OR OTHER JURISDICTION, AS
          APPLICABLE, AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED OR
          HYPOTHECATED OR OTHERWISE DISPOSED OF EXCEPT (A) IN ACCORDANCE WITH
          THE PROVISIONS OF REGULATION S PROMULGATED UNDER THE SECURITIES ACT,
          (B) PURSUANT TO REGISTRATION UNDER THE SECURITIES ACT AND APPROPRIATE
          QUALIFICATION UNDER THE SECURITIES LAWS OF ANY APPLICABLE STATE, OR
          (C) PURSUANT TO AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE
          SECURITIES ACT AND ANY APPLICABLE STATE SECURITIES LAWS. NO HEDGING
          TRANSACTIONS INVOLVING THE SECURITIES EVIDENCED BY THIS CERTIFICATE
          MAY BE CONDUCTED EXCEPT IN COMPLIANCE WITH THE SECURITIES ACT.

The Investor agrees and acknowledges that this Warrant is being purchased for
its own account, for investment purposes only, and not for the account of any
other person, and not with a view to distribution, assignment, pledge or resale
to others or to fractionalization in whole or in part. The Investor further
represents, warrants and agrees as follows: no other person has or will have a
direct or indirect beneficial interest in this Warrant and the Investor will not
sell, hypothecate or otherwise transfer the Warrant except in accordance with
the Securities Act and applicable state securities laws or unless, in the
opinion of counsel for the Investor acceptable to the Company, an exemption from
the registration requirements of the Securities Act and such laws is available;
and that Investor is an "accredited investor" under the Securities Act.

     7.   CLOSING OF BOOKS. The Company will at no time close its shareholder
books or records in any manner which interferes with the timely exercise of this
Warrant.

     8.   NO RIGHTS AS SHAREHOLDER UNTIL EXERCISE. This Warrant does not entitle
the Investor to any voting rights or other rights as a shareholder of the
Company prior to the exercise thereof. If, however, at the time of the surrender
of this Warrant and purchase of Warrant Shares the Investor shall be entitled to
exercise this Warrant, the shares so purchased shall be and be deemed to be
issued to the Investor as the record owner of such shares as of the close of
business on the date on which this Warrant shall have been exercised.

     9.   LOSS, THEFT, DESTRUCTION OR MUTILATION OF WARRANT. The Company
represents and warrants that upon receipt by the Company of evidence reasonably
satisfactory to it of the loss, theft, destruction or mutilation of any Warrant,
and in case of loss, theft or destruction, of indemnity or security reasonably
satisfactory to it, and upon reimbursement to the Company of all reasonable
expenses incidental thereto, and upon surrender and cancellation of such
Warrant, if mutilated, the Company will make and deliver a new Warrant of like
tenor and dated as of such cancellation, in lieu of this Warrant.

                                       3
<PAGE>

     10.  SATURDAYS, SUNDAYS, HOLIDAYS, ETC. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday, Sunday or a legal holiday in the United States, then
such action may be taken or such right may be exercised on the next succeeding
day not a Saturday, Sunday or legal holiday.

     11.  ADJUSTMENTS OF EXERCISE PRICE AND NUMBER OF WARRANT SHARES. In the
event of any stock split, reverse stock split, stock dividend, reclassification
or similar event affecting the Common Stock occurring after the date hereof
(each an "ADJUSTMENT TRANSACTION"), (i) the Exercise Price shall be adjusted by
multiplying it by a fraction, the numerator of which shall be the number of
shares of Common Stock outstanding immediately prior to such Adjustment
Transaction, and the denominator of which shall be the number of shares of
Common Stock outstanding immediately after such Adjustment Transaction, and (ii)
the number of Warrant Shares purchasable upon exercise of this Warrant
immediately prior thereto shall be adjusted by multiplying it by a fraction, the
numerator of which shall be the number of shares of Common Stock outstanding
immediately after such Adjustment Transaction, and the denominator of which
shall be the number of shares of Common Stock outstanding immediately prior to
such Adjustment Transaction; PROVIDED, HOWEVER, that the Company shall not issue
any fractional shares of Common Stock in any exercise of this Warrant, and the
number of shares of Common Stock issuable upon such exercise, if not a whole
number, shall be rounded up to the next whole number of shares.

     12.  VOLUNTARY ADJUSTMENT BY THE COMPANY. The Company may at its
discretion, at any time during the term of this Warrant, reduce the then current
Exercise Price to any amount and for any period of time deemed appropriate by
the Board of Directors of the Company.

     13.  NOTICE OF ADJUSTMENT. Whenever the number of Warrant Shares or number
or kind of securities or other property purchasable upon the exercise of this
Warrant or the Exercise Price is adjusted as herein provided, the Company shall
promptly mail by registered or certified mail, return receipt requested, to the
Investor notice of such adjustment or adjustments setting forth the number of
Warrant Shares (and other securities or property) purchasable upon the exercise
of this Warrant and the Exercise Price of such Warrant Shares after such
adjustment, setting forth a brief statement of the facts requiring such
adjustment and setting forth computation by which such adjustment was made. Such
notice, in absence of manifest error, shall be conclusive evidence of the
correctness of such adjustment.

     14.  AUTHORIZED SHARES. The Company covenants that during the period the
Warrant is outstanding, it will reserve from its authorized and unissued Common
Stock a sufficient number of shares to provide for the issuance of the Warrant
Shares upon the exercise of any rights under this Warrant. The Company further
covenants that its issuance of this Warrant shall constitute full authority to
its officers who are charged with the duty of executing stock certificates to
execute and issue the necessary certificates for shares of the Company's Common
Stock upon the exercise of the purchase rights under this Warrant. The Company
will take all such reasonable action as may be necessary to assure that such
shares of Common Stock may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of the OTC Bulletin Board
or any domestic securities exchange upon which the Common Stock may be listed.

                                       4
<PAGE>

     15.  MISCELLANEOUS.

          (a)  ISSUE DATE; JURISDICTION. The provisions of this Warrant shall be
construed and shall be given effect in all respects as if it had been issued and
delivered by the Company on the date hereof. This Warrant shall be binding upon
any successors or assigns of the parties hereto. This Warrant shall constitute a
contract under the laws and jurisdiction of the state of Nevada and for all
purposes shall be construed in accordance with and governed by the laws of said
state without regard to its conflict of law, principles or rules.

          (b)  RESTRICTIONS. The Investor acknowledges that the Common Stock
acquired upon the exercise of this Warrant, if not registered, may have
restrictions upon its resale imposed by state and federal securities laws.

          (c)  MODIFICATION AND WAIVER. This Warrant and any provisions hereof
may be changed, waived, discharged or terminated only by an instrument in
writing signed by the party against which enforcement of the same is sought.

          (d)  NOTICES. Any notice, request or other document required or
permitted to be given or delivered to the Investor or the Company shall be
delivered or shall be sent by certified or registered mail, postage prepaid, to
the Investor at its address as shown on the books of the Company or to the
Company at the address set forth in the Note.

     IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its officers thereunto duly authorized.

Dated:   May 11, 2001

                                       VOICE MOBILITY INTERNATIONAL, INC.

                                       By:
                                               ---------------------------------
                                       Name:   James Hewett
                                              ----------------------------------
                                       Title:  CFO
                                              ----------------------------------

                                       5
<PAGE>

                               NOTICE OF EXERCISE

To:      Voice Mobility International, Inc.

          (1)  The undersigned hereby elects to purchase _________________
shares of Common Stock of Voice Mobility International, Inc. pursuant to the
terms of the attached Warrant, and tenders herewith payment of the purchase
price in full, together with all applicable transfer taxes, if any.

          (2)  Please issue a certificate or certificates representing said
shares of Common Stock in the name of the undersigned.

Dated:
      ------------------               -----------------------------------------

                                       By:
                                            ------------------------------------
                                       Name:
                                              ----------------------------------
                                       Title:
                                             -----------------------------------

NOTE: Signature must conform in all respects to holder's name as specified on
the face of the attached warrant.

                                       6<PAGE>

        EXCHANGE AGREEMENT, dated as of June [    ], 2001, among UNITED
SURGICAL PARTNERS INTERNATIONAL, INC., a Delaware corporation (the "Company"),
and the several persons and entities listed on Annex I hereto (being
hereinafter called individually, a "Holder", and collectively, the "Holders").

                              W I T N E S S E T H:

        WHEREAS, pursuant to the Securities Purchase Agreement dated as of
October 26, 1998 (the "Purchase Agreement") among the Company and the Holders,
each of the Holders purchased 7% Senior Subordinated Notes (collectively, the
"Notes") of the Company in the aggregate principal amount set forth opposite
such Holder's name on Annex I under the heading "Aggregate Principal Amount of
Notes"; and

        WHEREAS, for the benefit of the Company and the Holders, the Company
wishes to issue an aggregate 20,000 shares of Series D Redeemable Preferred
Stock, $.01 par value (the "Series D Preferred Stock"), of the Company, to the
Holders in exchange for the Notes, and the Holders wish to exchange the Notes
held by them for the Series D Preferred Stock, all on the terms and subject to
the conditions hereinafter set forth; and

        NOW, THEREFORE, in consideration of the premises and the mutual
covenants herein contained, the parties hereto agree as follows:

        SECTION 1. EXCHANGE OF NOTES FOR SERIES D PREFERRED STOCK.

        (a) On the effective date of the initial public offering of the
Company's Common Stock, $.01 par value ("Common Stock"), registered under the
Securities Act of 1933, as amended (the "Initial Public Offering"), each of
the Holders shall transfer and assign to the Company all of its right, title
and interest in and to his, her or its Notes and, in connection therewith,
such Holder shall deliver such Notes to the Company for cancellation.

        (b)  Solely in exchange for the Notes transferred and assigned to the
Company by each Holder, and against delivery thereof as aforesaid, the Company
shall (i)issue and deliver to such Holder a stock certificate in definitive
form, registered in the name of such Holder, evidencing the number of shares
of Series D Preferred Stock set forth opposite such Holder's name on Annex I
under the heading "Number of Shares of Series D Preferred Stock" and (ii) pay
to such Holder any accrued and unpaid interest on such Notes as of the date of
such exchange.

        SECTION 2. CERTIFICATE OF AMENDMENT OF CERTIFICATE OF INCORPORATION.
Concurrently with the exchange and issuance of the Series D Preferred Stock
described in Section 1 above, the Company shall amend its Certificate of
Incorporation in the manner specified in the Certificate of Amendment to the
Certificate of Incorporation (the "Certificate of Amendment") attached hereto
as Exhibit A.

<PAGE>

        SECTION 3. CLOSING.  The closing of the transactions contemplated by
Section 1 hereof shall take place immediately prior to the Initial Public
Offering at the offices of [the Company], or at such other place as may be
mutually agreed upon by the Holders and the Company.  The Company shall give
notice to each of the Holders at least five (5) days prior to the Initial
Public Offering.

        SECTION 4. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  The Company
represents and warrants to the Holders as follows:

        (a)  ORGANIZATION AND CORPORATE POWER.  The Company is a corporation
duly incorporated, validly existing and in good standing under the laws of the
State of Delaware.  The Company has the corporate power and authority to own
and hold its properties, to carry on its business as currently conducted and
to execute, deliver and perform this Agreement.  The Company has the corporate
power and authority to issue, sell and deliver the Series D Preferred Stock to
the Holders.

        (b)  AUTHORIZATION OF AGREEMENTS, ETC.  Each of (i) the execution and
delivery by the Company of this Agreement, (ii) the performance by the Company
of its respective obligations hereunder, (iii) the execution and delivery of
the Certificate of Amendment and (iv) the issuance, sale and delivery of the
Series D Preferred Stock, has been duly authorized by all requisite corporate
action and will not violate any provision of law, any order of any court or
other agency of government, the Certificate of Incorporation or Bylaws of the
Company, or any provision of any indenture, agreement or other instrument to
which the Company or any subsidiary, or any of the properties or assets of the
Company or any subsidiary is bound, or conflict with, result in a breach of or
constitute (with due notice or lapse of time or both) a default under any such
indenture, agreement or other instrument, or result in the creation or
imposition of any lien, charge or encumbrance of any nature whatsoever upon
any of the properties or assets of the Company or any subsidiary.  The Series
D Preferred Stock has been duly authorized by the Company and, when issued and
delivered in accordance with this Agreement, will be validly issued and
outstanding, fully paid and nonassessable shares of Series D Preferred Stock,
free and clear of all liens and encumbrances.  The issuance, sale and delivery
of the Series D Preferred Stock is not subject to any preemptive rights of
stockholders of the Company or to any right of first refusal or other similar
right in favor of any person.

        (c)  VALIDITY.  This Agreement has been duly executed and delivered by
the Company and constitutes the legal, valid and binding obligation of the
Company, enforceable against the Company in accordance with its terms,
subject, as to enforcement of remedies, to applicable bankruptcy, insolvency,
reorganization, moratorium and similar laws from time to time in effect
affecting the enforcement of creditors' rights generally and to general
principles of equity.

        (d)  GOVERNMENTAL APPROVALS.  Subject to the accuracy of the
representations and warranties of the Holders set forth in Section 5 hereof,
no registration or filing with, or consent or approval of, or other action by,
any Federal, state or other governmental agency or instrumentality is or will
be necessary for the valid execution, delivery and performance of this

                                        2
<PAGE>

Agreement, the execution and delivery of the Certificate of Amendment or the
issuance and delivery of the Series D Preferred Stock pursuant to the terms
hereof.

        SECTION 5. REPRESENTATIONS AND WARRANTIES OF THE HOLDERS.  Each of the
Holders, severally and not jointly, represents and warrants to the Company as
follows:

        (a)  TITLE TO NOTES.  Such Holder is the lawful owner, of record and
beneficially, of the Notes in the aggregate principal amount set forth
opposite its name on Annex I hereto, which Notes are free and clear of all
liens, charges and encumbrances and are not subject to any claims of any kind
whatsoever in favor of any person or entity.

        (b)  INVESTMENT REPRESENTATIONS.  Such Holder is acquiring the Series
D Preferred Stock for its own account for the purpose of investment and not
with a view to or for sale in connection with any distribution thereof.  Such
Holder understands that he, she or it, as the case may be, must bear the
economic risk of such Holder's investment for an indefinite period of time
because the shares of Series D Preferred Stock are not registered under the
Securities Act or any applicable state securities laws, and may not be resold
unless subsequently registered under the Securities Act and such other laws or
unless an exemption from such registration is available.  Such Holder agrees
not to pledge, transfer, convey or otherwise dispose of any of the Series D
Preferred Stock, except in a transaction that is the subject of either (i)an
effective registration statement under the Securities Act and any applicable
state securities laws, or (ii)an opinion of counsel to the effect that such
registration is not required.   Such Holder, to the extent that such Holder is
subject to the Connecticut Uniform Securities Act, is an institutional buyer
under Section 36b-21(b)(8) thereto.

        SECTION 6. MISCELLENEOUS.

        (a)  SURVIVAL OF AGREEMENTS.   All covenants, agreements,
representations and warranties made herein shall survive the execution and
delivery of this Agreement.   Nothing in this Agreement shall in any manner
alter the rights of the Holders under the Purchase Agreement.

        (b)  PARTIES IN INTEREST; THIRD PARTY BENEFICIARIES.   All the
covenants and agreements in this Agreement contained by or on behalf of the
parties hereto shall bind their successors and assigns, whether so expressed
or not.  This Agreement is not intended to confer any rights or remedies upon
any person other than the parties hereto.

        (c)  NOTICES.   Any notice or other communication required or
permitted hereunder shall be deemed to be sufficient if contained in a written
instrument that is (w) delivered in person, (x) sent by first class certified
mail, postage prepaid, (y) sent by nationally recognized overnight courier, or
(z) sent by facsimile (and followed by a copy of such notice sent in a manner
described in any of (w)-(y) above), in each case addressed to such party as
follows:

                                        3
<PAGE>

        (i)  if to the Company, to:

                United Surgical Partners International, Inc.
                17103 Preston Road
                Suite 200 North
                Dallas, Texas 75248
                Attention: Donald Steen
                Facsimile No.: (972) 267-0084

                with a copy to:

                Nossaman, Guthner, Knox & Elliott, LLP
                445 South Figueroa Street, 31st Floor
                Los Angeles, California 90071
                Attention: Robert Mosher, Esq.
                Facsimile No.: (213) 612-7801

        (ii)  if to any Holder, to such Holder at the address appearing on
Annex I hereto:

or, in any case, at such other address or addresses as shall have been
furnished in writing by such party to the other parties hereto.  All such
notices, requests, consents and other communications shall be deemed to have
been received (a) in the case of personal delivery, on the date of such
delivery, (b) in the case of mailing, on the fifth business day following the
date of such mailing, (c) in the case of delivery by overnight courier, on the
business day following the date of delivery to such courier, and (d) in the
case of facsimile, when received.

        (d)  ENTIRE AGREEMENT; AMENDMENT.   This Agreement constitutes the
entire agreement of the parties with respect to the subject matter hereof and
supersedes all prior agreements and understandings among the parties hereto
with respect to the subject matter hereof.   This Agreement may not be amended
or modified except in a writing signed by (i) the Company and (ii) Holders
holding at least 66-2/3% of the principal amount of the Notes, or after the
Initial Public Offering, at least 66-2/3% of the outstanding Series D
Preferred Stock.

        (e)  TERMINATION.  If the Initial Public Offering has not occurred on
or prior to December 31, 2001, this Agreement shall automatically terminate.

        (f)  COUNTERPARTS.   This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

        (g)  LAW GOVERNING.   THIS AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE.

                  [Remainder of Page Intentionally Left Blank]

                                        4
<PAGE>

        IN WITNESS WHEREOF, the Company and the Holders have executed this
Agreement as of the day and year first above written.

COMPANY:                                UNITED SURGICAL PARTNERS
                                          INTERNATIONAL, INC.

                                        By
                                          --------------------------------
                                           Name:
                                           Title:

HOLDERS:                                WELSH, CARSON, ANDERSON
                                          & STOWE VII, L.P.

                                        By WCAS VII Partners, L.P.
                                        General Partners

                                        By
                                          --------------------------------
                                        Jonathan M. Rather
                                        General Partner

                                        WCAS HEALTHCARE PARTNERS, L.P.

                                        By WCAS HC Partners
                                        General Partners

                                        By
                                          --------------------------------
                                        Jonathan M. Rather
                                        Attorney-in-Fact

                                        5
<PAGE>
                                        Patrick J. Welsh
                                        Russell L. Carson
                                        Bruce K. Anderson
                                        Richard H. Stowe
                                        Andrew M. Paul
                                        Laura VanBuren
                                        Rudolph E. Rupert
                                        D. Scott Mackesy
                                        Thomas E. McInerney
                                        Robert A. Minicucci
                                        Anthony J. deNicola
                                        Paul B. Queally

                                        By
                                          --------------------------------
                                        Jonathan M. Rather
                                        Individually and as Attorney-in-Fact

                                        ----------------------------------
                                        Lauren Melkus

                                        6

<PAGE>

                                        FFT PARTNERS I, L.P.
                                        By Ferrer Freeman Thompson & Co., LLC
                                        General Partner

                                        By
                                          --------------------------------
                                        Name:
                                        Title:

                                        FFT EXECUTIVE PARTNERS I, L.P.
                                        By Ferrer Freeman Thompson & Co., LLC
                                        General Partner

                                        By
                                          --------------------------------
                                        Name:
                                        Title:

                                        7
<PAGE>

                                     ANNEX I

                                     HOLDERS
<TABLE>
<CAPTION>
                                        Aggregate Principal       Number of Shares of
Holder                                    Amount of Note        Series D Preferred Stock
------                                    --------------        ------------------------
<S>                                     <C>                     <C>
Welsh, Carson, Anderson & Stowe VII, L.P.                       $
WCAS Healthcare Partners, L.P.
Patrick J. Welsh
Russell L. Carson
Bruce K. Anderson
Richard H. Stowe
Andrew M. Paul
Laura VanBuren
Rudolph E. Rupert
D. Scott Mackesy
Thomas E. McInerney
Robert A. Minicucci
Anthony J. deNicola
Paul B. Queally
Jonathan M. Rather
Lauren Melkus
FFT Partners I, L.P.
FFT Executive Partners I, L.P.
                                TOTAL     $ 20,000,000                  20,000
</TABLE>

                                        8

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