1. Japan Society of Obstetrics and Gynecology; Tokyo Japan
2. Department of Obstetrics and Gynecology; Juntendo University; Tokyo Japan
3. Department of Obstetrics and Gynecology; Hamamatsu University School of Medicine; Shizuoka Japan
4. Japan Association of Obstetricians and Gynecologists; Tokyo Japan
5. Shirota Clinic; Tokyo Japan
6. Department of Obstetrics and Gynecology; Nippon Medical School Tama Nagayama Hospital; Tokyo Japan
7. Japanese Red Cross Katsushika Maternity Hospital; Tokyo Japan
8. Japan Society of Perinatal and Neonatal Medicine; Tokyo Japan
9. Department of Obstetrics and Gynecology; Saitama Medical Center; Saitama Japan
10. Japanese Society of Anesthesiologists; Tokyo Japan
11. Department of Anesthesia; Saitama Medical Center; Saitama Japan
12. Japan Society of Transfusion Medicine and Cell Therapy; Tokyo Japan
13. The Japanese Red Cross Kanto-Koshinetsu Cord Blood Bank; Kanagawa Japan
14. Division of Transfusion Medicine; National Cerebral and Cardiovascular Center; Osaka Japan