1. Division of Gastroenterology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
2. Department of Internal Medicine, Dongguk University Ilsan Hospital, Goyang, Korea
3. Department of Internal Medicine, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea
4. Department of Internal Medicine, College of Medicine, Kyung Hee University, Seoul, Korea
5. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
6. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
7. Department of Internal Medicine, Biomedical Research Institute, Pusan National University School of Medicine, Pusan, Korea
8. Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea
9. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
10. Division of Gastroenterology, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Korea
11. Institute of Wonkwang Medical Science, Wonkwang University Hospital, Wonkwang University College of Medicine, Iksan, Korea
12. Department of Internal Medicine, Jeonbuk National University Hospital, Jeonbuk National University Medical School, Jeonju, Korea
13. Department of Internal Medicine and Liver Research Institute, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea