1. Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
2. Digestive Disease Center and Research Institute, Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
3. Department of Internal Medicine, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea
4. Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
5. Division of Gastroenterology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
6. Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Mukogawa-cho, Nishinomiya, Hyogo, Japan
7. Department of Gastroenterology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
8. Division of Gastroenterology, Department of Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
9. Department of Gastroenterology and Hepatology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
10. Gastro Centre, Ipoh, Malaysia
11. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
12. Department of Internal Medicine, College of Medicine, Soonchunhyang University Hospital, Seoul, Korea
13. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
14. Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea
15. Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
16. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
17. Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Gangwon-do, Korea
18. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, University of Ulsan College of Medicine, Seoul, Korea
19. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea
20. Division of Gastroenterology, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
21. Department of Internal Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
22. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea
23. Division of Gastroenterology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
24. Department of Internal Medicine and Digestive Disease Research Institute, Wonkwang University School of Medicine, Iksan, Korea
25. Department of Gastroenterology and Hepatology, Tokai University School of Medicine, Isehara, Kanagawa, Japan
26. Department of Medicine, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
27. Department of Medicine and Therapeutics, Prince of Wales Hospital, Hong Kong, China
28. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Gyeonggi-do, Korea
29. Department of Gastroenterology, Kobe University Hospital, Hyogo, Japan
30. Division of Gastroenterology and Hepatology, National University Health System, Singapore City, Singapore
31. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea