[1] Japan Soc Obstet & Gynecol, Tokyo, Japan
[2] Japan Assoc Obstetricians & Gynecologists, Tokyo, Japan
[3] Japan Soc Perinatal & Neonatal Med, Tokyo, Japan
[4] Japanese Soc Anesthesiologists, Tokyo, Japan
[5] Japan Soc Transfus Med & Cell Therapy, Tokyo, Japan
[6] Juntendo Univ, Shirota Clin, Tokyo, Japan
[7] Juntendo Univ, Dept Obstet & Gynecol, Tokyo, Japan
[8] Tama Nagayama Hosp, Dept Obstet & Gynecol, Nippon Med Sch, Tokyo, Japan
[9] Japanese Red Cross Katsushika Matern Hosp, Tokyo, Japan
[10] Japanese Red Cross Kanto Koshinetsu Cord Blood Ba, Fujisawa, Kanagawa, Japan
[11] Hamamatsu Univ Sch Med, Dept Obstet & Gynecol, Shizuoka, Japan
[12] Saitama Med Ctr, Dept Obstet & Gynecol, Saitama, Japan
[13] Saitama Med Ctr, Dept Anesthesia, Saitama, Japan
[14] Natl Cerebral & Cardiovasc Ctr, Div Transfus Med, Osaka, Japan