EX-99.1 2 a2178848zex-99_1.txt EXHIBIT 99.1 EXHIBIT 1 --------- AGREEMENT AS TO JOINT FILING OF SCHEDULE 13G -------------------------------------------- Each of the undersigned hereby affirms that it is individually eligible to use Schedule 13G, and agrees that this Schedule 13G is filed on its behalf. Dated: July 17, 2007 CITIGROUP PRIVATE EQUITY (OFFSHORE) LLC By: /s/ Ranesh Ramanathan -------------------------------------------- Name: Ranesh Ramanathan Title: Secretary CITIGROUP ALTERNATIVE INVESTMENTS LLC By: /s/ Millie Kim -------------------------------------------- Name: Millie Kim Title: Assistant Secretary CITIGROUP INVESTMENTS INC. By: /s/ Millie Kim -------------------------------------------- Name: Millie Kim Title: Assistant Secretary CITIGROUP INC. By: /s/ Riqueza V. Feaster -------------------------------------------- Name: Riqueza V. Feaster Title: Assistant Secretary