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Guizhou Med Univ, Affiliated Hosp, Dept Obstet & Gynecol, Reprod Med Ctr, Guiyang 550004, Guizhou, Peoples R China Guizhou Med Univ, Affiliated Hosp, Dept Obstet & Gynecol, Reprod Med Ctr, Guiyang 550004, Guizhou, Peoples R China