1. Departments of Obstetrics and Gynecology, Jichi Medical University School of Medicine
2. Perinatal Center, Division of Maternal and Fetal Medicine, Jichi Medical University, Saitama Medical Center
3. Perinatal Medical Center, Hirosaki University Hospital
4. Department of Endocrinology and Hypertension, Tokyo Women’s Medical University
5. Center for Maternal, Fetal and Neonatal Medicine, Saitama Medical Center, Saitama Medical University