1 Division of Obstetrics, Center for Maternal-Fetal Neonatal and Reproductive Medicine, National Center for Child Health and Development, Tokyo, Japan.
2 Division of Neonatology, Center for Maternal-Fetal Neonatal and Reproductive Medicine, National Center for Child Health and Development, Tokyo, Japan.
3 Division of Endocrinology and Metabolism, National Center for Child Health and Development, Tokyo, Japan.