Institution: | 1. Maternal Fetal Medicine, Osaka Medical Center and Research Institute for Maternal and Child Health, Izumi, Japan;2. Obstetrics, Tokuyama Central Hospital, Tokuyama, Japan;3. Department of Maternal Fetal and Neonatal Medicine, National Center for Child Health and Development, Tokyo, Japan;4. Division of Perinatology, Maternal and Perinatal Care Center, Seirei Hamamatsu General Hospital, Hamamatsu, Japan |