1. Department of Surgery, The Armed Forces Gangneung Hospital, Gangneung, Korea.
2. Department of Surgery, Soonchunhyang University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, The Armed Forces Gangneung Hospital, Gangneung, Korea.
4. Department of Radiology, The Armed Forces Capital Hospital, Seongnam, Korea.
5. Department of Internal Medicine, The Armed Forces Pusan Hospital, Busan, Korea.