| Affiliation: | 1. Division of Gastroenterology, Department of Internal Medicine and Gastrointestinal Cancer Center, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea;2. Center for Crohn's and Colitis, Department of Gastroenterology and Hepatology, Kyung Hee University School of Medicine, Seoul, Korea;3. Division of Gastroenterology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea;4. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea;5. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea;6. Department of Internal Medicine, Hanyang University Guri Hospital, Gyeonggi-Do, Korea;7. Department of Internal Medicine, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea;8. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea |
