<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>a2184585zex-99_1.txt
<DESCRIPTION>EXHIBIT 99.1
<TEXT>
<Page>


<TABLE>
<CAPTION>

                                                        EXHIBIT 1
                                                        ---------

<S>                 <C>

                     IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARIES WHICH ACQUIRED SECURITIES
                     --------------------------------------------------------------------------------

                     Citigroup Global Markets Inc. is a broker or dealer registered
                     under Section 15 of the Act (15 U.S.C. 78o).

                     Tribeca Global Management LLC is an investment adviser in
                     accordance with Section 240.13d-1(b) (1)(ii)(E)

                     Each of the undersigned hereby affirms the identification
                     and Item 3 classification of the subsidiaries which
                     acquired the security holdings reported in this
                     Schedule 13G.


                     Date: April 9, 2008


                                         CITIGROUP INC.


                                         By: /s/ Riqueza V. Feaster
                                         -------------------------------------
                                         Name:  Riqueza V. Feaster
                                         Title: Assistant Secretary

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