[1] Saitama Med Univ, Saitama Med Ctr, Dept Obstet & Gynecol, 1981 Kamoda, Kawagoe, Saitama 3508550, Japan
[2] Japanese Fdn Canc Res, Canc Inst Hosp, Dept Gynecol, 3-8-31 Ariake,Koto Ku, Tokyo 1358550, Japan
[3] Japanese Red Cross Maebashi Hosp, Dept Obstet & Gynecol, 389-1 Asakura Machi, Maebashi, Gunma 3710811, Japan
[4] Jichi Med Univ, Saitama Med Ctr, Dept Obstet & Gynecol, 1-847 Amanuma Cho,Omiya Ku, Saitama 3308503, Japan
[5] Japanese Red Cross Maebashi Hosp, Dept Obstet & Gynecol, 389-1 Asakura Machi, Maebashi, Gunma 3710811, Japan