1. From the Departments of Radiology (S.K.J., J.M.L., I.J., J.K.H.), Surgery (J.Y.J.), and Pathology (K.B.L.), Seoul National University Hospital, 101 Daehangno, Jongno-gu, Seoul 03080, Korea; Department of Radiology (J.M.L., J.K.H.) and Division of Gastroenterology, Department of Internal Medicine, (J.K.R.), Seoul National University College of Medicine, Seoul, Korea; Department of Radiology, Chung-Ang University Hospital, Seoul, Korea (E.S.L., H.J.P.); and Institute of Radiation Medicine, Seoul National...