1. Department of Radiology, Division of Gastroenterology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea.
2. Department of Internal Medicine, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea.
3. Department of Surgery, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Korea.