1. Department of Surgery; Institute of Health Biosciences; The University of Tokushima Graduate School; Tokushima Japan
2. Department of Internal Medicine; Tokyo Metropolitan Komagome Hospital; Tokyo Japan
3. First Department of Surgery; University of Yamanashi; Kofu Japan
4. Department of Pediatric Surgery; Kansai Medical University; Hirakata Japan
5. Department of Pediatric Surgery; Niigata University; Niigata Japan
6. Department of Pediatric Surgery; Shizuoka Children's Hospital; Shizuoka Japan
7. Department of Surgery; Yokohama City University; Yokohama Japan
8. Department of Pediatric Surgery; Tohoku University; Sendai Japan
9. Department of Pediatric Surgery; Kyushu University; Fukuoka Japan
10. Aichi Prefectual Colony; Kasugai Japan