Exhibit 3.7

HEALTH FINANCE CORPORATION

BY-LAWS

ARTICLE I

MEETINGS OF STOCKHOLDERS

Section 1. Place of Meeting and Notice. Meetings of the stockholders of Health Finance Corporation (the “Corporation”) shall be held at such place either within or without the State of Delaware as the Board of Directors may determine.

Section 2. Annual and Special Meetings. Annual meetings of stockholders shall be held, at a date, time and place fixed by the Board of Directors and stated in the notice of meeting, to elect a Board of Directors and to transact such other business as may properly come before the meeting. Special meetings of the stockholders may be called by the Chief Executive Officer for any purpose and shall be called by the Chief Executive Officer if directed by the Board of Directors or requested in writing by the holders of not less than 25% of the capital stock of the Corporation. Each such stockholder request shall state the purpose of the proposed meeting.

Section 3. Notice. Except as otherwise provided by law, at least 10 and not more than 60 days before each meeting of stockholders, written notice of the time, date and place of the meeting, and, in the case of a special meeting, the purpose or purposes for which the meeting is called, shall be given to each stockholder.

Section 4. Quorum. At any meeting of stockholders, the holders of record, present in person or by proxy, of a majority of the Corporation’s issued and outstanding capital stock shall constitute a quorum for the transaction of business, except as otherwise provided by law. In the absence of a quorum, any officer entitled to preside at or to act as secretary of the meeting shall have power to adjourn the meeting from time to time until a quorum is present.

Section 5. Voting. Except as otherwise provided by law, all matters submitted to a meeting of stockholders shall be decided by vote of the holders of record, present in person or by proxy, of a majority of the Corporation’s issued and outstanding capital stock.

ARTICLE II

DIRECTORS

Section 1. Number, Election and Removal of Directors. The number of Directors that shall constitute the Board of Directors shall not be less than one or more than fifteen. The first Board of Directors shall consist of one Director. Thereafter, within the limits specified above, the number of Directors shall be determined by the Board of Directors or the

stockholders. The Directors shall be elected by stockholders at their annual meeting. Vacancies and newly created directorships resulting from any increase in the number of Directors may be filled by a majority of the Directors then in office, although less than a quorum, or by the sole remaining Director or by the stockholders. A Director may be removed with or without cause by the stockholders.

Section 2. Meetings. Regular meetings of the Board of Directors shall be held at such times and places as may from time to time be fixed by the Board of Directors or as may be specified in a notice of meeting. Special meetings of the Board of Directors may be held at any time upon the call of the Chief Executive Officer and shall be called by the Chief Executive Officer if directed by the Board of Directors.

Section 3. Notice. Notice need not be given of regular meetings of the Board of Directors. At least one business day before each special meeting of the Board of Directors, written or oral (either in person or by telephone), notice of the time, date and place of the meeting and the purpose or purposes for which the meeting is called, shall be given to each Director; provided that notice of any meeting need not be given to any Director who shall be present at such meeting (in person or by telephone) or who shall waive notice thereof in writing either before or after such meeting.

Section 4. Quorum. A majority of the total number of Directors shall constitute a quorum for the transaction of business. If a quorum is not present at any meeting of the Board of Directors, the Directors present may adjourn the meeting from time to time, without notice other than announcement at the meeting, until such a quorum is present. Except as otherwise provided by law, the Certificate of Incorporation of the Corporation, these By-Laws or any contract or agreement to which the Corporation is a party, the act of a majority of the Directors present at any meeting at which there is a quorum shall be the act of the Board of Directors.

Section 5. Committees. The Board of Directors may, by resolution adopted by a majority of the whole Board, designate one or more committees, including, without limitation, an Executive Committee, to have and exercise such power and authority as the Board of Directors shall specify. In the absence or disqualification of a member of a committee, the member or members thereof present at any meeting and not disqualified from voting, whether or not he or they constitute a quorum, may unanimously appoint another Director to act for the absent or disqualified member.

ARTICLE III

OFFICERS

The officers of the Corporation shall consist of a Chief Executive Officer and such other additional officers with such titles as the Board of Directors shall determine, all of which shall be chosen by and shall serve at the pleasure of the Board of Directors. Such officers shall have the usual powers and shall perform all the usual duties incident to their respective offices. All officers shall be subject to the supervision and direction of the Board of Directors. The authority, duties or responsibilities of any officer of the Corporation may be suspended by

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the Chief Executive Officer with or without cause. Any officer elected or appointed by the Board of Directors may be removed by the Board of Directors with or without cause.

ARTICLE IV

INDEMNIFICATION

The Corporation shall, to the fullest extent permitted from time to time under the law of the State of Delaware, indemnify and upon request shall advance expenses to any person who is or was a party or is threatened to be made a party to any threatened, pending or completed action, suit, proceeding or claim, whether civil, criminal, administrative or investigative, by reason of the fact that such person is or was or has agreed to be a director or officer of the Corporation or while a director or officer is or was serving at the request of the Corporation as a director, officer, partner, member, trustee, employee or agent of any corporation, partnership, joint venture, trust or other enterprise, including, without limitation, service with respect to employee benefit plans, against expenses (including, without limitation, attorney’s fees and expenses), judgments, fines, penalties and amounts paid in settlement incurred in connection with the investigation, preparation to defend or defense of such action, suit, proceeding or claim; provided, however, that the foregoing shall not require the Corporation to indemnify or advance expenses to any person in connection with any action, suit, proceeding, claim or counterclaim initiated by or on behalf of such person. Such indemnification and advancement of expenses shall not be exclusive of other indemnification rights arising as a matter of law, under any By-Law, agreement, vote of directors or stockholders or otherwise, both as to action in such person’s official capacity and as to action in another capacity while holding such office, and shall inure to the benefit of the heirs and legal representatives of such person. Any person seeking indemnification under this Article IV shall be deemed to have met the standard of conduct required for such indemnification unless the contrary shall be established. Any repeal or modification of the foregoing provisions of this Article IV shall not adversely affect any right or protection of a director or officer of the Corporation with respect to any acts or omissions of such director or officer occurring prior to such repeal or modification.

The Corporation shall have the power to purchase and maintain, at its expense, insurance on behalf of any person who is or was a director, officer, employee or agent of the Corporation, or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, against any expense, liability or loss asserted against such person and incurred by such person in any such capacity, or arising out of such person’s status as such, whether or not the Corporation would have the power to indemnify such person against such expense, liability or loss under the General Corporation Law of the State of Delaware or the terms of these By-Laws.

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ARTICLE V

GENERAL PROVISIONS

Section 1. Fiscal Year. The fiscal year of the Corporation shall be fixed by the Board of Directors.

Section 2. Corporate Books. The books of the corporation may be kept at such place within or outside the State of Delaware as the Board of Directors may from time to time determine.

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