1. From the Departments of Radiology (D.H.L., J.Y.L., J.S.B., J.K.H.), Surgery (N.J.Y., K.W.L., K.S.S.), and Pathology (H.K., K.B.L.), Seoul National University Hospital, 101 Daehangno, Jongno-gu, Seoul 03080, Korea; and Institute of Radiation Medicine, Seoul National University College of Medicine, Seoul, Korea (J.Y.L., J.K.H.).