1. From the Departments of Radiology (M.J.P., K.H., C.A., H.J.K., H.K., M.S.P.) and Biostatistics (K.H., C.M.N.), Yonsei University College of Medicine, Severance Hospital, 50 Yonsei-Ro, Seodaemun-Gu, Seoul 120-752, Korea; Department of Radiology, Ulsan University College of Medicine, Asan Medical Center, Seoul, Korea (N.H., S.H.P.); Center for Colorectal Cancer, National Cancer Center, Ilsan, Korea (M.J.K.); Department of Radiology, Seoul National University College of Medicine, Bundang Hospital, Bundang,...