1. Department of Pediatrics Jichi Medical University Shimotsuke City Tochigi Japan
2. Department of Pediatrics and Adolescent Medicine Juntendo University Graduate School of Medicine Bunkyo Tokyo Japan
3. Department of Gastrointestinal and Pediatric Surgery Mie University Graduate School of Medicine Tsu City Mie Japan
4. Inflammatory Bowel Disease Center Yokohama City University Medical Center Yokohama City Kanagawa Japan
5. Inflammatory Bowel Disease Center Yokohama Municipal Hospital Yokohama City Kanagawa Japan
6. Division of Gastroenterology National Center for Child Health and Development Setagaya Tokyo Japan
7. Division of General Practice National Center for Child Health and Development Setagaya Tokyo Japan
8. Department of Pediatrics Osaka General Medical Center Toshima Osaka Japan
9. Inflammatory Bowel Disease Center Sakura Medical Hospital Toho University Medical Center Sakura City Chiba Japan