1. From the Department of Radiology and Research Institute of Radiology (S.H.C., S.S.L., Y.M.S., M.G.L.), Department of Gastroenterology (K.M.K.), and Department of Pathology (E.Y., Y.P.), University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, South Korea; and Department of Radiology, Gil Medical Center, Gachon University, Incheon, South Korea (S.H.P.).