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