1. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea
2. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea
3. Institute for Digestive Research, Soonchunhyang University College of Medicine, Seoul, Korea
4. Division of Gastroenterology, Department of Internal Medicine, Eulji General Hospital, Eulji University School of Medicine, Seoul, Korea
5. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
6. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Konyang University Hospital, Daejeon, Korea
7. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Gyeonggi-do, Korea
8. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
9. Department of Surgery, Ewha Womans University School of Medicine, Seoul, Korea
10. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Korea
11. Department of Internal Medicine and Digestive Disease Research Institute, Wonkwang University School of Medicine, Iksan, Korea
12. Steering Committee for Clinical Practice Guideline, Korean Academy of Medical Science, Korea