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Exhibit B
POWER OF ATTORNEY
Know all by these presents, that the undersigned
hereby constitutes and appoints Heath Weisberg, signing singly, with full power of substitution, the undersigned’s true and
lawful attorney-in-fact to:
(1) execute for and on behalf of the undersigned
any applications, reports, or documents required or deemed appropriate by the attorney-in-fact to file pursuant to (i) the United
States Securities Exchange Act of 1934, as amended, or any rule, or regulation thereunder, including, without limitation, Schedules
13D, 13G, 13F, and 13H, and Forms 3, 4, and 5, (ii) the Securities Act of 1933, as amended, or any rule or regulation thereunder,
including, without limitation, Form 144, (iii) the U.S. Commodity Exchange Act, as amended or any rule or regulation thereunder,
or (iv) the statutes, rules or regulations of any other domestic or foreign governmental or self-regulatory authority;
(2) do and perform any and all acts for and
on behalf of the undersigned which may be necessary or desirable to complete and execute any such applications, reports, or documents;
(3) take any other action of any type whatsoever
in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interests of,
or legally required by the undersigned, it being understood that the documents executed by such 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 such attorney-in-fact
may approve in such attorney-in-fact’s discretion.
The undersigned hereby grants to each such
attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or 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 attorney-in-fact, or such attorney-in-fact’s 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. The undersigned acknowledges that the foregoing attorney-in-fact,
in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned’s
responsibilities to comply with the applicable statutes, rules and regulations.
This Power of Attorney shall remain in full
force and effect until revoked by the undersigned in a signed writing delivered to the foregoing attorney-in-fact or otherwise
terminated by my death or other event described in section 5-1511 of the New York General Obligations Law.
SIGNATURE AND ACKNOWLEDGMENT:
In Witness Whereof I have hereunto signed my
name on the 9th day of May, 2013.
/s/ Bruce Kovner
Bruce Kovner
STATE OF NEW YORK )
) ss:
COUNTY OF NEW YORK )
On the 9th day of May 2013, before me, the
undersigned, personally appeared Bruce Kovner, personally known to me or proved to me on the basis of satisfactory evidence to
be the individual whose name is subscribed to the within instrument and acknowledged to me that he/she executed the same in his/her
capacity, and that by his/her signature on the instrument, the individual, or the person upon behalf of which the individual acted,
executed the instrument.
/s/ Cynthia Rosel Rivera
Notary Public
