1. Department of Pediatrics and Adolescent Medicine; Juntendo University Graduate School of Medicine; Tokyo Japan
2. PAL Children's Clinic; Gunma Japan
3. Department of Pediatrics; Osaka General Medical Center; Osaka Japan
4. Inflammatory Bowel Centre; Yokohama City University Medical Centre; Yokohama Japan
5. Department of Pediatrics; Gunma University Graduate School of Medicine; Maebashi Japan
6. Department of Pediatric Gastroenterology, Nutrition and Endocrinology; Osaka Medical Center and Research Institute for Maternal and Child Health; Osaka Japan
7. Division of Gastroenterology; National Center for Child Health and Development; Tokyo Japan
8. Department of Pediatrics; Osaka Medical College; Osaka Japan
9. Department of Pediatrics; Kurume University Medical Center; Kurume Japan
10. Department of Pediatrics; Tokyo Women's Medical University Hospital; Tokyo Japan
11. Department of Gastrointestinal and Pediatric Surgery; Mie University Graduate School of Medicine; Mie Japan
12. General Health Support Center; Gunma University Graduate School of Medicine; Maebashi Japan