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Explanation of Responses:
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1)
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Securities reported herein for Camber Capital Management LLC (the "LLC" ) represent Common Stock beneficially owned and held of record by Camber Capital Master Fund, L.P. (the "Master Fund"), another private investment fund (the "Fund") and one managed account (the "Managed Account") for which the LLC serves as the investment manager. Stephen DuBois is the managing member of the LLC and managing member of the general partner for the Fund and the Master Fund. The LLC, the Master Fund, the Fund, the Managed Account, general partner and Mr. DuBois (the "Reporting Persons") are each beneficial owners and have an address of 101 Huntington Avenue, Floor 25, Boston, MA 02199. The Reporting Persons disclaim beneficial ownership, within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the shares in which the Reporting Persons have no actual pecuniary interest therein.
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2)
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Of the securities reported for this transaction, 482,750 shares of Common Stock were purchased for the account of the Master Fund, 3,400 shares of Common Stock were purchased for the account of the Fund, and 13,850 shares of Common Stock were purchased for the account of the Managed Account.
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3)
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Of the securities reported for this transaction, 231,616 shares of Common Stock were purchased for the account of the Master Fund, 1,631 shares of Common Stock were purchased for the account of the Fund, and 6,645 shares of Common Stock were purchased for the account of the Managed Account.
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4)
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Of the securities reported for this transaction, 21,001 shares of Common Stock were purchased for the account of the Master Fund, 148 shares of Common Stock were purchased for the account of the Fund, and 603 shares of Common Stock were purchased for the account of the Managed Account.
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5)
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Of the securities reported for this transaction, 157,763 shares of Common Stock were purchased for the account of the Master Fund, 1,111 shares of Common Stock were purchased for the account of the Fund, and 4,526 shares of Common Stock were purchased for the account of the Managed Account.
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6)
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Of the securities reported for this transaction, 157,104 shares of Common Stock were purchased for the account of the Master Fund, 1,107 shares of Common Stock were purchased for the account of the Fund, and 4,507 shares of Common Stock were purchased for the account of the Managed Account.
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7)
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Of the securities reported for this transaction, 156,641 shares of Common Stock were purchased for the account of the Master Fund, 1,103 shares of Common Stock were purchased for the account of the Fund, and 4,494 shares of Common Stock were purchased for the account of the Managed Account.
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8)
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Of the securities reported for this transaction, 378,476 shares of Common Stock were purchased for the account of the Master Fund, 2,666 shares of Common Stock were purchased for the account of the Fund, and 10,858 shares of Common Stock were purchased for the account of the Managed Account.
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9)
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Of the securities reported for this transaction, 7,724 shares of Common Stock were purchased for the account of the Master Fund, 54 shares of Common Stock were purchased for the account of the Fund, and 222 shares of Common Stock were purchased for the account of the Managed Account.
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10)
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As of the closing of trading on October 8, 2015, 14,866,283 shares of Common Stock were held for the account of the Master Fund, 104,708 shares of Common Stock were held for the account of the Fund, and 429,009 shares of Common Stock were held for the account of the Managed Account.
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