1. From the Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY; Departments of Medicine and Biostatistics, Duke University, Durham; Department of Medicine, University of North Carolina, Chapel Hill, NC; Department of Medicine, Loyola University, Chicago, IL; Department of Medicine, University of Wisconsin, Madison, WI; Department of Medicine, University of Alberta, Alberta, Canada; and the Dana-Farber Cancer Institute, Boston, MA