1. From the Department of Epidemiology and Biostatistics, the Department of Anesthesiology and Critical Care, and the Department of Medicine, Memorial Sloan-Kettering Cancer Center, the Department of Medicine, The Mount Sinai Medical Center, New York, NY; City of Hope National Medical Center, Duarte, CA; the Department of Medicine, the University of Arkansas for Medical Sciences; and the John L. McClellan Memorial Veterans Hospital, Little Rock, AK.