...
机译:
Shanghai Jiao Tong Univ, Ren Ji Hosp, Sch Med, Ctr Reprod Med, 845 Lingshan Rd, Shanghai 200135;
Shanghai Jiao Tong Univ, Ren Ji Hosp, Sch Med, Dept Obstet & Gynecol, Shanghai, Peoples R China;
Oregon Hlth & Sci Univ, Dept Obstet & Gynecol, Portland, OR 97201 USA;