1. Department of Internal Medicine; National Defense Medical College; Saitama Japan
2. Department of Gastroenterology and Hepatology; Tokyo Medical and Dental University; Tokyo Japan
3. Center for Advanced IBD Research and Treatment; Kitasato University Kitasato Institute Hospital; Tokyo Japan
4. Division of Inflammatory Bowel Disease, Department of Internal Medicine; Hyogo College of Medicine; Nishinomiya Hyōgo Prefecture Japan
5. Division of Gastroenterology and Hepatology, Department of Internal Medicine; Toho University Medical Centre, Sakura Hospital, Faculty of Medicine, Toho University; Funabashi Chiba Prefecture Japan
6. International University of Health and Welfare Graduate School; Tokyo Japan