EX-99.7

Exhibit 99.7

POWER OF ATTORNEY

KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and appoints Cristiana Blauth Oliveira as the undersigned’s true and lawful attorney-in-fact (the “Attorney-in-Fact”) to:

execute for and on behalf of the undersigned (the “Reporting Person”) a Form ID Application and/or “Update Passphrase Confirmation,” if required, and submit the same to the United States Securities and Exchange Commission (the “Commission”);

execute for and on behalf of the Reporting Person any and all reports, notices, communications and other documents (including, but not limited to, reports on Schedule 13D, Schedule 13G, Form 13-F, Form 3, Form 4 and Form 5) that such Reporting Person may be required to file with the Commission pursuant to the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended (collectively, the “Reports”) with respect to the Reporting Person’s (a) status as an officer or director of, or (b) ownership of, or transactions in, securities of, any entity whose securities are beneficially owned (directly or indirectly) by such Reporting Person (each, a “Company”);

do and perform any and all acts for and on behalf of the Reporting Person which may be necessary or desirable to complete and execute any such Reports and timely file such forms and schedules with the Commission and any stock exchange or similar authority; and

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 the Attorney-in-Fact’s discretion.

The undersigned hereby grants to the Attorney-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 the Attorney-in-Fact, or her substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5, Form 13F or Schedules 13G/D with respect to the undersigned’s holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the Attorney-in-Fact. The Reporting Person acknowledges that the Attorney-in-Fact, in serving in such capacity at the request of the undersigned, is not hereby assuming any of the undersigned’s responsibilities to comply with Section 13 or Section 16 of the Securities Exchange Act of 1934 and state or federal securities laws. This Power of Attorney may be filed with the Commission as a confirming statement of the authority granted herein.

[SIGNATURES ON THE FOLLOWING PAGE.]