1. Department of Pediatric Surgery; Kurume University School of Medicine; Kurume Japan
2. Japanese Study Group of Allied Disorders of Hirschsprung's Disease; Japan
3. Department of Pediatrics; Kurume University Medical Center; Kurume Japan
4. Department of Pediatrics and Child Health; Kurume University School of Medicine; Kurume Japan
5. Department of Pediatric Surgery; Graduate School of Medical and Dental Sciences Kagoshima University; Kagoshima Japan
6. Department of Pediatric Surgery; St Luke's International Hospital; Tokyo Japan
7. Department of Pediatric Surgery; Graduate School of Medical Sciences; Kyushu University; Fukuoka Japan