1. Department of Pediatrics and Child Health Kurume University School of Medicine Kurume Japan
2. Division of Gastroenterology National Center for Child Health and Development Tokyo Japan
3. Department of Pediatrics Juntendo University Faculty of Medicine Tokyo Japan
4. Division of Gastroenterology and Hepatology Saitama Children's Medical Center Saitama Japan
5. Department of Pediatrics Osaka General Medical Center Osaka Japan
6. Department of Pediatrics Osaka Medical College Osaka Japan
7. Department of Infection and Immunology Aichi Children's Health and Medical Center Obu Japan
8. Department of Pediatrics, Faculty of Medicine Saga University Saga Japan
9. Department of Pediatrics Nagasaki University Graduate School of Biomedical Sciences Nagasaki Japan
10. Department of Pediatric Hepatology and Gastroenterology Saiseikai Yokohamashi Tobu Hospital Yokohama Japan
11. Department of Pediatrics Sapporo Kosei General Hospital Sapporo Japan
12. Department of Gastroenterology and Endocrinology Osaka Women's and Children's Hospital Osaka Japan
13. Biostatistics Center Kurume University School of Medicine Kurume Japan
14. Medical & Biological Laboratories Nagoya Japan
15. Division of Gastroenterology, Department of Medicine Kurume University School of Medicine Kurume Japan