1. From the Department of Radiology (S.H.L., J.M.C., N.C., W.K.M.) and Medical Research Collaborating Center (M.J.J.), Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 03080, Republic of Korea; and Department of Radiology, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea (A.Y.).