1. Department of Pediatric Surgery, Reproductive and Developmental Medicine, Faculty of Medical Sciences; Kyushu University; Fukuoka Japan
2. Department of Pediatric Surgery; Japan Community Health care Organization Kyushu Hospital; Kitakyushu Japan
3. Department of Pediatric Surgery; Miyazaki Prefectural Miyazaki Hospital; Miyazaki Japan
4. Department of Pediatric Surgery; Kagoshima University Graduate School of Medical and Dental Sciences; Kagoshima Japan