1. Center for Diagnostic and Therapeutic Endoscopy, School of Medicine, Keio University, Tokyo, Japan
2. Center for Advanced IBD Research and Treatment, Kitasato University, Kitasato Institute Hospital, Tokyo, Japan
3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Toho University Sakura Medical Center, Chiba, Japan
4. Center for Gastroenterology and Inflammatory Bowel Disease, Ofuna Chuo Hospital, Kanagawa, Japan
5. Department of Gastroenterology and Hepatology, Tokyo Medical and Dental University, Tokyo, Japan
6. Department of Preventive Medicine and Public Health, Biostatistics at Center for Clinical Research, School of Medicine, Keio University, Tokyo, Japan
7. Institute of Gastroenterology, Tokyo Women’s Medical University, Tokyo, Japan
8. The Third Department of Internal Medicine, Kyorin University School of Medicine, Tokyo, Japan
9. Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan