1. From the Department of Radiology, University of Pennsylvania Health System, Philadelphia, Pa (S.P., T.K., S.S., M.I.); Department of Radiology, Seoul National University Hospital, Seoul, Republic of Korea (S.H.); and Department of Radiology, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea (S.H.).