1. Division of Gastroenterology and Hepatology; Department of Internal Medicine; Institute of Digestive Disease and Nutrition; Korea University College of Medicine; Seoul South Korea
2. Yonsei University, Wonju College of Medicine; Department of Internal Medicine; Wonju South Korea
3. Department of Internal Medicine; Institute of Gastroenterology; Yonsei University College of Medicine; Seoul South Korea
4. Division of Hepatology; Department of Internal Medicine; College of Medicine; Seoul St. Mary's Hospital, The Catholic University of Korea; Seoul South Korea
5. Institute for Digestive Research; Digestive Disease Center; Division of Gastroenterology; Department of Internal Medicine; College of Medicine; Soonchunhyang University; Seoul South Korea
6. Department of Internal Medicine; Division of Hepatology; Inha University School of Medicine; Incheon South Korea
7. Department of Internal Medicine; Korea University Ansan Hospital; Ansan South Korea
8. Department of Internal Medicine; Kyungpook National University Hospital, Kyungpook National University College of Medicine; Daegu South Korea
9. Department of Internal Medicine; CHA Bundang Medical Center; CHA University; Bundang South Korea
10. Departments of Internal Medicine and Preventive Medicine; Inje University Busan Paik Hospital; Inje University College of Medicine; Busan South Korea
11. Department of Internal Medicine; Catholic University of Daegu School of Medicine; Daegu South Korea
12. Department of Internal Medicine; Chonbuk National University Medical School and Hospital; Seoul South Korea
13. Division of Gastroenterology and Hepatology; Department of Internal Medicine; Konyang University School of Medicine; Daejeon South Korea
14. Department of Internal Medicine; Soonchunhyang University Bucheon Hospital; Bucheon South Korea