1. From the Departments of Radiology and Research Institute of Radiology (S.J.C., S.S.L., H.J.P., S.H.C., D.W.K., J.K.J.), Oncology (K.H.J.), Clinical Epidemiology and Biostatistics (J.B.L.), and Pathology (H.J.K.), University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea.