Michihiro Yamamura1, Hiroaki Aoki1, Keiko Yabuzaki1, Akihiro Hasegawa1, Taisuke Sato1, Tomona Matsuoka1, Haruhiko Udagawa1, Yuki Ito1, Kazuhiro Kajiwara1, Taizan Kamide1, Kentaro Matsuoka2, Osamu Samura1, Aikou Okamoto1
(1. Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo, Japan, 2. Dokkyo Medical University Saitama Medical Center, Saitama, Japan)