1. Department of Pediatrics and
2. Department of Neonatal Medicine, Maternal and Perinatal Center, Tokyo Women’s Medical University, Tokyo, Japan;
3. Department of Neonatology, Tokyo Metropolitan Children’s Medical Center, Tokyo, Japan;
4. Department of Pediatrics, Saitama Medical Center and Saitama Medical University, Saitama, Japan;
5. Department of Pediatrics and Child Health, School of Medicine, Nihon University, Tokyo, Japan;
6. Department of Pediatrics, Iino Women’s and Children’s Hospital, Tokyo, Japan;
7. Department of Neonatology, Nagaoka Red Cross Hospital, Niigata, Japan;
8. Department of Pediatrics, National Hospital Organization Nagasaki Medical Center, Nagasaki, Japan; and
9. Division of Neonatology, Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development, Tokyo, Japan
10. Basic Clinical Science and Public Health, School of Medicine, Tokai University, Kanagawa, Japan;