[1] Shizuoka Canc Ctr, Dept Gynecol, Shizuoka 4118777, Japan
[2] Japanese Red Cross Shizuoka Hosp, Dept Obstet & Gynecol, Shizuoka, Shizuoka 4200853, Japan
[3] Oita Univ, Fac Med, Dept Obstet & Gynecol, Yufu City, Oita 8795593, Japan
[4] Kansai Rousai Hosp, Dept Obstet & Gynecol, Amagasaki, Hyogo 6608511, Japan