1. From National Cancer Institute, Bethesda, Maryland; Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri; Geisel School of Medicine at Dartmouth, Hanover, New Hampshire; Houston Methodist Hospital, Houston, Texas; University of Alabama at Birmingham, Birmingham, Alabama; David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California; and University of Michigan, Ann Arbor, Michigan.