1. From the Department of Radiology (H.K., J.M.G., C.M.P.) and Department of 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 (J.M.G., C.M.P.); and Cancer Research Institute, Seoul National University, Seoul, Korea (J.M.G., Y.T.K., C.M.P.).