1. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Cheju Halla General Hospital, Jeju, Korea.
3. Department of Radiology, Korea University College of Medicine, Seoul, Korea.
4. Department of Surgery, Korea University College of Medicine, Seoul, Korea.
5. Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Korea.