1. Department of Radiology, Seoul National University Hospital, Seoul, Korea.
2. Department of Pathology, Seoul National University Hospital, Seoul, 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, Healthcare System Gangnam Center, Seoul National University Hospital, Seoul, Korea.