1. From the Department of Radiology (J.Y.K., J.J.K., L.H.) and Busan Cancer Center (T.K., H.P.), Pusan National University Hospital, 1-10 Ami-Dong, Seo-gu, Busan 602-739, Republic of Korea; and Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Republic of Korea (J.Y.K.).