1. Division of Maternal Medicine, Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development , Tokyo, Japan
2. Department of Obstetrics and Gynecology, Yamagata University Hospital , Yamagata, Japan
3. Department of Obstetrics and Gynecology, Osaka Medical and Pharmaceutical University , Osaka, Japan
4. Department of Obstetrics and Gynecology, Nagoya City University, Graduate School of Medical Science , Nagoya, Japan
5. Department of Obstetrics and Gynecology, Osaka Women’s and Children’s Hospital , Osaka, Japan
6. Department of Regional Pediatrics and Perinatology, Ehime University Graduate School of Medicine , Ehime, Japan
7. Department of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine, Hokkaido University , Sapporo, Japan
8. Showa University Research Administration Center, Showa University , Tokyo, Japan
9. Children’s Cancer Center, National Center for Child Health and Development , Tokyo, Japan