1. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
6. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
7. Department of Internal Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
8. Division of Gastroenterology, Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
9. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
10. Department of Gastroenterology, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
11. Department of Internal Medicine, Chungbuk National University School of Medicine, Cheongju, Chungcheongbuk-do, Korea
12. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
13. Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
14. Catholic Photomedicine Research Institute, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
15. Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University College of Medicine, Seoul, Korea
16. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Chungcheongnam-do, Korea
17. Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Gangwon-do, Korea
18. Department of Internal Medicine, Dongguk University College of Medicine, Goyang, Gyeonggi-do, Korea
19. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Gyeonggi-do, Korea
20. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Changwon, Gyeongsangnam-do, Korea
21. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea
22. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
23. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
24. Health Promotion, Gangnam Severance Hospital, Seoul, Korea
25. Department of Gastroenterology, Ajou University School of Medicine, Suwon, Gyeonggi-do, Korea