1. *Associate Professor, Department of Anesthesia, Bowman Gray School of Medicine, Winston-Salem, North Carolina.†Director, Departments of Anesthesia and Ambulatory Surgery, The Methodist Medical Center of Illinois, Peoria, Illinois.†Associate Professor, Department of Anesthesiology, Emory School of Medicine. Atlanta, Georgia.§Assistant Professor, Department of Anesthcsiology, Mt. Sinai School of Me