1. From the Department of Radiology (S.Y.K., W.K.M.) and Medical Research Collaborating Center (Y.C.), Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehakro, Jongno-gu, Seoul 03080, Republic of Korea; Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea (B.K.H.); Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea (E.K.K.); and Department of...