1. From the Department of Radiology (H.C.), Chung-Ang University Hospital, College of Medicine, Chung-Ang University, Seoul, Korea; Departments of Internal Medicine (Y.S.P.), Thoracic and Cardiovascular Surgery (K.J.N., S.P., I.K.P., C.H.K., Y.T.K.), and Radiology (J.M.G., S.H.Y.), Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea.