1. Department of Pediatric Surgery; Yamanashi Prefectural Central Hospital; Yamanashi Japan
2. Department of Pediatrics; University of Yamanashi, School of Medicine; Yamanashi Japan
3. Department of Pediatrics; Yamanashi Prefectural Central Hospital; Yamanashi Japan
4. Department of Pediatric Surgery; University of Yamanashi, School of Medicine; Yamanashi Japan