Exhibit 99

MHR CAPITAL PARTNERS MASTER ACCOUNT LP

By: MHR Advisors LLC,
its General Partner

By: /s/ Janet Yeung
    -----------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHR ADVISORS LLC

By: /s/ Janet Yeung
    -----------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHR INSTITUTIONAL PARTNERS II LP

By: MHR Institutional Advisors II LLC,
its General Partner

By: /s/ Janet Yeung
    -----------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHR INSTITUTIONAL PARTNERS IIA LP

By: MHR Institutional Advisors II LLC,
its General Partner

By: /s/ Janet Yeung
    ------------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHR INSTITUTIONAL ADVISORS II LLC

By: /s/ Janet Yeung
    ------------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHRC LLC

By: /s/ Janet Yeung
    ------------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHRC II LLC

By: /s/ Janet Yeung
    ------------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHR FUND MANAGEMENT LLC

By: /s/ Janet Yeung
    ------------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019


MHR HOLDINGS LLC

By: /s/ Janet Yeung
    -----------------------------------
    Name: Janet Yeung
    Title: Authorized Signatory

Address:   40 West 57th Street,
           24th Floor
           New York, NY 10019