[1] Teine Keijinkai Hosp, Ctr Recurrent Pregnancy Loss, 1 40 Maeda 1 jho 12 chome Teine ku, Sapporo, Hokkaido 0068555, Japan
[2] Kobe Univ, Sch Med, Dept Obstet & Gynecol, 7 5 1 Kusunoki cho Chuo ku, Kobe, Hyogo, Japan
[3] Toyama Univ, Dept Obstet & Gynecol, 2630 Sugitani, Toyama, Japan
[4] Nippon Med Sch, Dept Obstet & Gynecol, 1 1 5 Sendagi,Bunkyo ku, Tokyo, Japan