1. Division of Gastroenterology, Department of Internal Medicine, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea
2. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea
3. Deparment of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
4. Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea
5. Division of Gastroenterology, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
6. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea
7. Department of Internal Medicine, Yeungnam University School of Medicine, Daegu, Korea
8. Department of Internal Medicine, Gyeongsang National University School of Medicine, Jinju, Korea
9. Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
10. Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea
11. Division of Gastroenterology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea
12. Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
13. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea
14. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea
15. Department of Internal Medicine, St. Paul Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
16. Department of Internal Medicine, Konyang University Hospital, Daejeon, Korea
17. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
18. Department of Internal Medicine, Dongguk University College of Medicine, Gyeongju, Korea
19. Division of Gastroenterology, Department of Internal Medicine, Daegu Catholic University College of Medicine, Daegu, Korea
20. Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
21. Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea
22. Department of Internal Medicine, Eulji University College of Medicine, Daejeon, Korea
23. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea
24. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
25. Department of Internal Medicine, Sahmyook Medical Center, Seoul, Korea
26. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
27. Department of Internal Medicine, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
28. Department of Internal Medicine, National Medical Center, Seoul, Korea