1. Center for Human Development and Family Science, Department of Neonatology and Pediatrics Nagoya City University Graduate School of Medical Sciences Aichi Japan
2. Department of Neonatology Kanagawa Children's Medical Center Kanagawa Japan
3. Division of Neonatology National Hospital Organization Okayama Medical Center Okayama Japan
4. Department of Pediatrics The University of Tokyo Hospital Tokyo Japan
5. Department of Pediatrics Japanese Red Cross Aichi Medical Center Nagoya Daiichi Hospital Aichi Japan
6. Division of Neonatology Center of Maternal‐Fetal Neonatal and Reproductive Medicine, National Center for Child Health and Development Tokyo Japan
7. Department of Pediatrics, Perinatal Medical Center Himeji Red Cross Hospital Hyogo Japan
8. Department of Pediatrics Kurashiki Central Hospital Okayama Japan
9. Department of Pediatrics Yodogawa Christian Hospital Osaka Japan