1. Department of Endocrinology and Hypertension (N.W., S.M., F.M., T.A., D.W., A.I.), Tokyo Women's Medical University, Tokyo 162-8666, Japan
2. Department of Maternal-Fetal Neonatal Medicine (N.W., T.S., K.T., H.S.), National Center for Child Health and Development, 157-8535, Japan
3. Department of Social Medicine (T.F.), National Research Institute for Child Health and Development, Tokyo,157-8535, Japan
4. Department of Obstetrics and Gynecology (T.K.), Osaka University, Osaka 565-0871, Japan