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