1. Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo 160-8582, Japan
2. Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo 157-8583, Japan
3. Department of Bioinformatics and Genomics, Graduate School of Advanced Preventive Medical Sciences, Kanazawa University, Kanazawa 920-8640, Japan
4. Department of Internal Medicine, Keio University School of Medicine, Tokyo 160-8582, Japan
5. Department of Women’s Health, National Center for Child Health and Development, Tokyo 157-8583, Japan