1. Department of Internal Medicine, Pusan National University College of Medicine, and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
2. Department of Internal Medicine, Hanyang University Hospital, Seoul, Korea
3. Division of Gastroenterology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea
4. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
5. Division of Gastroenterology, Department of Internal Medicine, Korea University Ansan Hospital, Ansan, Korea
6. Department of Internal Medicine, Gyeongsang National University College of Medicine, Jinju, Korea
7. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea
8. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Institute of Gastrointestinal Medical Instrument Research, Korea University College of Medicine, Seoul, Korea
9. Department of Internal Medicine, Jeonbuk National University Hospital, Jeonju, Korea
10. Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul National University of College of Medicine, Seoul, Korea
11. Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
12. Department of Internal Medicine, Soonchunhyang University College of Medicine, Cheonan, Korea
13. Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea
14. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
15. Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea
16. Department of Internal Medicine, Dongguk University College of Medicine, Seoul, Korea
17. Department of Internal Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea
18. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
19. Department of Internal Medicine, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
20. Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Korea
21. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
22. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
23. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea
24. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
25. Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, Korea