1. From the Department of Radiology and Institute of Radiation Medicine, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea (J.H.L., H.K., E.J.H., J.M.G., C.M.P.); Department of Radiology, Healthcare Research Institute, Healthcare System Gangnam Center, Seoul National University Hospital, Seoul, Korea (H.Y.S.); and Lunit Inc, Seoul, Korea (S.P.).