1. Department of Surgery, GangNeung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
2. Department of Gastroenterology, GangNeung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
3. Department of Interventional Radiology, GangNeung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.