[1] Tottori Univ, Sch Med, Dept Obstet & Gynecol, Tottori 6838504, Japan
[2] Keio Univ, Sch Med, Dept Obstet & Gynecol, Tokyo 160, Japan
[3] Kyushu Univ, Grad Sch Med Sci, Dept Gynecol & Obstet, Fukuoka, Japan
[4] Sapporo Med Univ, Dept Obstet & Gynecol, Sch Med, Sapporo, Hokkaido, Japan
[5] Hyogo Canc Ctr, Dept Gynecol Oncol, Akashi, Hyogo, Japan
[6] Kitano Hosp, Dept Obstet & Gynecol, Osaka, Japan
[7] Tohoku Univ, Sch Med, Dept Obstet & Gynecol, Sendai, Miyagi 980, Japan
[8] Osaka Univ, Grad Sch Med, Dept Obstet & Gynecol, Osaka, Japan
[9] Tottori Univ Hosp, Ctr Canc, Tottori, Japan