Affiliation: | 1. Center for Maternal-Fetal and Neonatal Medicine, National Center for Child Health and Development, Tokyo, Japan Department of Obstetrics and Gynecology, Tokyo Women's Medical University, Tokyo, Japan;2. Center for Maternal-Fetal and Neonatal Medicine, National Center for Child Health and Development, Tokyo, Japan;3. Department of Obstetrics and Gynecology, Tokyo Women's Medical University, Tokyo, Japan |