F1The shares of common stock were held directly by Vestar Capital Partners V, L.P. ("Vestar V"), Vestar Capital Partners V-A, L.P. ("Vestar V-A"), Vestar Capital Partners V-B, L.P. ("Vestar V-B"), Vestar Executives V, L.P. ("Executives V"), Vestar Co-Invest V, L.P. ("Co-Invest V") and Vestar Investors V, L.P. ("Investors V" and collectively with Vestar V, Vestar V- A, Vestar V-B, Executives V and Co-Invest V, the "Vestar Investors").
F2Vestar Associates V, L.P. ("Vestar Associates V") is the general partner of Vestar V, Vestar V-A, Vestar V-B and Executives V and has voting and investment power over the securities held or controlled by each of them. Vestar Managers V Ltd. ("VMV") is the general partner of Co-Invest V and Investors V and has voting and investment power over the securities held or controlled by each of them. VMV is also the general partner of Vestar Associates V. Daniel S. O'Connell is the sole director of VMV and as a result he may be deemed to share beneficial ownership of the securities held directly by the Vestar Investors. Each of Vestar V, Vestar Associates V, VMV and Mr. O'Connell disclaims beneficial ownership of any securities held directly by the Vestar Investors, except to the extent of his or its pecuniary interest therein.