1. From the Departments of Radiology (K.D.S., M.W.L., H.R., T.W.K., D.I.C., H.K.L.) and Medicine (D.H.S.), Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-Ro, Gangnam-Gu, Seoul 06351, Republic of Korea; and Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Republic of Korea (M.W.L., H.R., H.K.L.).