1. Division of Neonatology, Center for Maternal–Neonatal Care Nagoya University Hospital Nagoya Japan
2. Division of Neonatology Center for Maternal–Fetal and Neonatal Medicine, National Center for Child Health and Development Tokyo Japan
3. Department of Obstetrics and Gynecology University of Toyama Toyama Japan
4. Department of Obstetrics Osaka Medical Center and Research Institute for Maternal and Child Health Izumi Japan
5. Department of Pediatrics and Child Health School of Medicine Nihon University Tokyo Japan
6. Department of Neonatology Toho University Omori Medical Center Tokyo Japan
7. Maternity and Perinatal Center Hokkaido University Hospital Sapporo Japan
8. Department of Obstetrics and Gynecology Showa University Yokohama Northern Hospital Yokohama Japan
9. Department of Neonatology, Perinatal Medical Center Kagoshima City Hospital Kagoshima Japan
10. Division of Obstetric Anesthesia Saitama Medical Center Kawagoe Japan
11. Department of Pediatric Surgery Faculty of Medicine University of Tsukuba Tsukuba Japan
12. Maternal and Perinatal Care Center Seirei Hamamatsu General Hospital Hamamatsu Japan
13. Department of Obstetrics and Gynecology Nippon Medical School Tama Nagayama Hospital Tokyo Japan
14. Department of Obstetrics and Gynecology School of Medicine St. Marianna University Kawasaki Japan
15. Department of Neonatology Nagano Children's Hospital Azumino Japan