[1] Ohki Mem Canc Ctr Women, Tokorozawa, Saitama, Japan
[2] Natl Def Med Coll, Tokorozawa, Saitama 359, Japan
[3] Nishisaitama Chuo Natl Hosp, Tokorozawa, Saitama, Japan
[4] Univ Tokyo, Fac Med, Dept Obstet & Gynecol, Tokyo 113, Japan
[5] Kawakita Gen Hosp, Dept Obstet & Gynecol, Tokyo, Japan
[6] Nara Prefectural Nara Hosp, Nara, Japan