1. Department of Pediatrics Jichi Medical University Shimotsuke Tochigi Japan
2. Department of Pediatrics Faculty of Medicine Juntendo University Bunkyo‐ku Tokyo Japan
3. Division of Gastroenterology and Hepatology Saitama Children's Medical Center Saitama City Saitama Japan
4. Department of Gastroenterology, Nutrition and Endocrinology Osaka Women's and Children's Hospital Izumi Osaka Japan
5. Department of Pediatrics Sapporo Kosei General Hospital Sapporo Hokkaido Japan
6. Division of pediatric surgery Chiba Children's Hospital Chiba City Chiba Japan
7. Inflammatory Bowel Disease Center Yokohama City University Medical Center Yokohama Kanagawa Japan
8. Division of Inflammatory Bowel Disease Department of Gastroenterological Surgery Hyogo College of Medicine Nishinomiya Hyogo Japan
9. Department of Gastroenterology and Hepatology Graduate School of Medicine Dentistry and Pharmaceutical Sciences Okayama University Okayama Japan
10. Division of Gastroenterology and Hepatology Third Department of Internal Medicine Kansai Medical University Hirakata Osaka Japan
11. First Department of Medicine Hamamatsu University School Medicine Hamamatsu Shizuoka Japan
12. Department of Gastroenterology and Hepatology Kyorin University School of Medicine Mitaka‐shi Tokyo Japan
13. Department of Gastroenterology School of Medicine Juntendo University Bunkyo‐ku Tokyo Japan