1. Department of Internal Medicine, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
2. Division of Gastroenterology, Department of Internal Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Chungnam National University College of Medicine, Daejeon, Korea
4. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
5. Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
6. Department of Internal Medicine, Hallym University Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea
7. Department of Internal Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea
8. Department of Internal Medicine, Hanyang University Medical Center, Seoul, Korea
9. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
10. Department of Gastroenterology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
11. Department of Internal Medicine, Konkuk University Medical Center, Konkuk University College of Medicine, Seoul, Korea
12. Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
13. Department of Internal Medicine, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea
14. Department of Internal Medicine, Pusan National University College of Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
15. Digestive Disease Center and Research Institute, Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
16. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea