Prot# EFC3558: Mltctr, Rndmzd, Dbl-Bld, Prl'l Grp Trial to Demonstrate Efficacy of Fondaparinux Sodium in Assoct'n w/ Intermittent Pneumatic Compression vs Intermittent Pneumatic Compression used Alone for Prevention of Venous Thromboembolic Events in Hig