POWER OF ATTORNEY
For Executing Forms 3, 4, and 5

	Know all men by these presents, that the undersigned hereby appoints each of Thomas W. Hawkins
and Vivian Lopez-Blanco, with full power of substitution, the true and lawful attorneys-in-fact to:

(1)	execute for and on behalf of the undersigned SEC Forms 3, 4, and 5 relating to the
undersigned's interest in the Company's securities, in accordance with Section 16(a) of the
Securities Exchange Act of 1934, as amended, and the rules thereunder;

(2)	do and perform any and all acts for and on behalf of the undersigned which may be
necessary or desirable to complete the execution of any such Form 3, 4, or 5 and the timely
filing of such form with the United States Securities and Exchange Commission and any
other appropriate authority; and

(3)	take any other action of any type whatsoever in connection with the foregoing which, in the
opinion of the attorney-in-fact, may be of benefit to, in the best interest of, or legally required
by, the undersigned, it being understood that the documents executed by the attorney-in-fact
on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as the attorney-in-fact may approve in his discretion.

       The undersigned hereby grants to the above attorneys-in-fact full power and authority to do and
perform all and every act and thing whatsoever requisite, necessary and proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might
or could do if personally present, with full power of substitution or revocation, hereby ratifying and
confirming all that such attorneys-in-fact, shall lawfully do or cause to be done by virtue of this Power of
Attorney and the rights and powers herein granted.  The undersigned acknowledges that the above
attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming any of the
undersigned's responsibilities to comply with Sections 13(d) or 16 of the Securities Exchange Act of 1937.

	The authority of Thomas W. Hawkins and Vivian Lopez-Blanco under this Power of Attorney shall
continue until the undersigned is no longer required to file Forms 3, 4, or 5 with regard to the undersigned's
ownership of or transactions in securities of the Company, unless earlier revoked in writing.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of
this 6th day of  May, 2010.


										/s/ Donna E. Shalala, PhD.
										Donna E. Shalala, PhD.