1. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Division of Gastroenterology, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
3. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Catholic University of Korea College of Medicine, Seoul, Korea.
5. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea.
7. Department of Internal Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea.
8. Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea.
9. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
10. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.
11. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
13. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
14. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
15. Department of Internal Medicine, Wonkwang University School of Medicine, Iksan, Korea.
16. Department of Internal Medicine, Ilsan Paik Hospital, Inje University College of Medicine, Ilsan, Korea.
17. Department of Internal Medicine, Inha University Hospital, Inha University School of Medicine, Incheon, Korea.
18. Department of Gastroenterology, Jeonbuk National University Hospital, Jeonju, Korea.
19. Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea.
20. Department of Internal Medicine, School of Medicine, Chungnam National University, Daejeon, Korea.