1. From the Departments of Radiology (H.K., J.M.G., C.M.P.) and Thoracic and Cardiovascular Surgery (Y.T.K.), Seoul National University College of Medicine, 101, Daehak-ro, Jongno-gu, Seoul, 03080, Korea; Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea (H.K., J.M.G., C.M.P.); and Cancer Research Institute, Seoul National University, Seoul, Korea (J.M.G., Y.T.K., C.M.P.).