1. From the Department of Radiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea (G.Y.Y.); and Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea (G.Y.Y., W.J.C., H.H.K., J.H.C., H.J.S., E.Y.C.).