1. Department of Internal Medicine, The Catholic University of Korea, 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, Seoul National University Boramae Medical Center, Seoul National University of College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Digestive Disease Center, CHA Bundang Medical Center, CHA University, Seongnam, Gyeonggi-do, Korea
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Gyeonggi-do, Korea
6. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
7. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
8. Digestive Disease Center and Research Institute, Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Gyeonggi-do, Korea
9. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
10. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea