1. From the Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, #101 Daehak-ro, Jongno-gu, Seoul, 03080, Korea (H.C.K., J.W. Choi, J.W. Chung); Department of Diagnostic Radiology, Fukuiken Saiseikai Hospital, Fukui, Japan (S.M.); and Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea (G.M.K.).