1. Department of Radiology, Seoul Metropolitan Government Seoul National University, Boramae Medical Center, Seoul, Korea.
2. Department of Radiology, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 03080, Korea.
3. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
4. Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea.
5. Department of Radiology, Veterans Health Service Medical Center, Seoul, Korea.