1. Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Radiology, Seoul National University Hospital, Seoul, Korea.
3. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
4. Medical Research Collaborating Center (MRCC), Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Surgery, Seoul National University Hospital, Seoul, Korea.