1. Digestive Disease Center, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
2. Division of Gastroenterology, Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.
3. Division of Gastroenterology & Hepatology, Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Korea.
4. Division of Gastroenterology, Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
5. Division of Gastroenterology, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Ilsan, Korea.
6. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea.
7. Department of Radiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea.