1. From the Department of Radiology (J.C., M.S.F., W.S.K., T.S., B.C., N.T., C.Y.), University of Washington, Seattle; the Department of Radiology (J.C.), PLA General Hospital, Beijing, China; VA Puget Sound Health Care System, and Department of Surgery (T.S.H.), University of Washington, Seattle; and Mountain-Whisper-Light Statistical Consulting (N.L.P.), Seattle, Wash.