1. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
2. Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
4. Department of Internal Medicine, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea
6. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
7. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea
8. Department of Internal Medicine, Daejeon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Daejeon, Korea
9. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
10. Department of Internal Medicine, Ewha Womans University Seoul Hospital, Ewha Womans University School of Medicine, Seoul, Korea
11. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea