Bear, Stearns & Co. Inc., J.P. Morgan Securities Inc., Lehman Brothers, Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated, U.S. Bancorp Piper Jaffray, Inc., UBS Securities LLC, f/k/a UBS Warburg LLC, Goldman, Sachs & Co., Citigroup Global Markets Inc., f/k/a Salomon Smith Barney Inc., Credit Suisse First Boston LLC, f/k/a Credit Suisse First Boston Corporation, Morgan Stanley & Co. Incorporated, Deutsche Bank Securities, Inc. and Thomas Weisel Partners LLC