1. Iidabashi Ladies's Clinic; Tokyo Japan
2. Department of Nursing Science; Hirosaki University Graduate School of Health Sciences; Aomori Japan
3. Department of Obstetrics and Gynecology; Niigata City General Hospital; Niigata Japan
4. Makita Obstetrics and Gynecology Clinic; Saitama Japan
5. Fukushima Medical Center for Children and Women; Fukushima Medical University; Fukushima Japan
6. Mochizuki Women's Clinic; Tochigi Japan
7. Department of Comprehensive Reproductive Medicine; Tokyo Medical and Dental University; Tokyo Japan
8. Department of Reproductive and Menopausal Medicine; Tokushima University Graduate School; Tokushima Japan
9. Department of Obstetrics and Gynecology; Tokyo Dental College Ichikawa General Hospital; Chiba Japan