1. Study Group for Rare and Intractable Chronic Gastrointestinal Diseases supported by Health Labour Sciences Research Grant; Ministry of Health Labour and Welfare; Tokyo Japan
2. Department of Pediatrics; Juntendo University; Faculty of Medicine; Tokyo Japan
3. Division of Gastroenterology; National Center for Child Health and Development; Tokyo Japan
4. Division of Pediatrics; Department of Medicine; Tohoku Medical and Pharmaceutical University; Miyagi Japan
5. Osaka Women's and Children's Hospital; Osaka Japan
6. Department of Pediatric Surgery; Kindai University Nara Hospital; Nara Japan
7. Department of Pediatrics; Kindai University Nara Hospital; Nara Japan
8. Department of Pediatric Surgery; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan
9. Department of Pediatrics; Osaka Medical College; Osaka Japan
10. Division of Pediatric Surgery; Department of Surgery; Showa University School of Medicine; Tokyo Japan
11. PAL Children's Clinic; Gunma Japan
12. Department of Pediatrics and Child Health; Kurume University School of Medicine; Fukuoka Japan
13. Children's Medical Center; Kyushu University Hospital; Fukuoka Japan