1. From the Department of Radiology and Research Institute of Radiology (S.H.C., S.S.L., S.Y.K., So Hyun Park, Seong Ho Park, M.G.L.); Department of Internal Medicine (K.M.K.), and Department of Diagnostic Pathology (S.M.H., E.Y.), University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-Ro 43-Gil, Songpa-Gu, Seoul 138-736, Korea.