1. Department of Pediatrics; Graduate School of Medical Science; Kyushu University; Fukuoka Japan
2. Faculty of Medicine; Department of Pediatrics; Oita University; Oita Japan
3. Department of Neonatology; Kawasaki Medical School Hospital; Okayama Japan
4. Department of Neonatology; Gifu Prefectural General Medical Center; Gifu Japan
5. Department of Neonatology; Japanese Red Cross Katsushika Maternity Hospital; Tokyo Japan
6. Department of Neonatology; Kumamoto City Hospital; Kumamoto Japan
7. Department of Neonatology; Ishikawa Prefectural Central Hospital; Kanazawa Japan
8. Department of Pediatrics; Toyama Prefectural Central Hospital; Toyama Japan
9. Department of Pediatrics; Showa University School of Medicine; Tokyo Japan
10. Department of Pediatrics; St Luke's International Hospital; Tokyo Japan
11. Department of Pediatrics; Iida Municipal Hospital; Iida Japan
12. Department of Pediatrics; Hyogo College of Medicine; Nishinomiya Japan
13. Department of Neonatology; Toho University Omori Medical Center; Tokyo Japan
14. Department of Pediatrics; Graduate School of Medicine; Kyoto University; Kyoto Japan
15. Department of Pediatrics; Fukushima Medical University; Fukushima Japan
16. Department of Pediatrics; Jichi Medical University; Shimotsuke Japan
17. Department of Pediatrics; Tenshi Hospital; Social Medical Corporation BOKOI; Sapporo Japan
18. Department of Obstetrics and Gynecology; The University of Tokyo Hospital; Tokyo Japan
19. Department of Pediatrics; Yokkaichi Municipal Hospital; Yokkaichi Japan
20. Department of Neonatal Intensive Care; Kurashiki Central Hospital; Kurashiki Japan
21. Department of Pediatrics; Rinku General Medical Center; Izumisano Japan
22. Department of Pediatrics; Kiryu Kosei General Hospital; Kiryu Japan
23. Department of Pediatrics; Medical Research Institute, Kitano Hospital; Osaka Japan
24. Department of Pediatrics; National Kyushu Medical Center; Fukuoka Japan