1. Division of Gastroenterology, Department of Internal Medicine, Seoul St. Mary Hospital, the Catholic University of Korea College of Medicine, Seoul, Korea.
2. Health Improvement Center, Seoul St. Mary Hospital, the Catholic University of Korea College of Medicine, Seoul, Korea.
3. Division of Infection, Department of Internal Medicine, Seoul St. Mary Hospital, the Catholic University of Korea College of Medicine, Seoul, Korea.
4. Department of Radiology, Seoul St. Mary Hospital, the Catholic University of Korea College of Medicine, Seoul, Korea.
5. Department of Pathology, Seoul St. Mary Hospital, the Catholic University of Korea College of Medicine, Seoul, Korea.
6. Department of Surgery, Seoul St. Mary Hospital, the Catholic University of Korea College of Medicine, Seoul, Korea.