1. Division of Gastroenterology, Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Cheonan, Chungcheongnam-do, Korea
2. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
3. Division of Gastroenterology, Department of Internal Medicine, Dankook University Hospital, Cheonan, Chungcheongnam-do, Korea
4. Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
5. Division of Gastroenterology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea
6. Department of Internal Medicine, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea
7. Division of Gastroenterology, Department of Internal Medicine, CHA University Ilsan Medical Center, CHA University School of Medicine, Ilsan, Gyeonggi-do, Korea
8. Division of Gastroenterology and Hepatology, Department of Internal Medicine, College of Medicine, Kyung Hee University, Seoul, Korea
9. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Gyeonggi-do, Korea
10. Department of Radiology, Konkuk University School of Medicine, Seoul, Korea
11. Department of Internal Medicine, Chosun University Hospital, Gwangju, Korea
12. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Changwon, Gyeongsangnam-do, Korea
13. Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Gangwon-do, Korea
14. Division of Gastroenterology, Department of Internal Medicine, Biomedical Research Institute, Jeonbuk National University Hospital, Jeonju, Jeollabuk-do, Korea
15. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea
16. Department of Surgery, The Catholic University of Korea, St. Vincent's Hospital, Suwon, Gyeonggi-do, Korea
17. Division of Colon and Rectal Surgery, Korea University Ansan Hospital, Ansan, Gyeonggi-do, Korea
18. Division of Healthcare Technology Assessment Research, National Evidence-Based Healthcare Collaborating Agency, Seoul, Korea
19. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea
20. Department of Gastroenterology, Digestive Research Disease Institute, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea