[1] Zhengzhou Univ, Affiliated Hosp 3, Dept Reprod Ctr, Zhengzhou, Peoples R China
[2] Zhengzhou Univ, Affiliated Hosp 3, Dept Clin Lab, Zhengzhou, Peoples R China
[3] Peoples Hosp Henan Prov, Dept Stomatol, Zhengzhou, Peoples R China
[4] Henan Univ, Women & Infants Hosp Zhengzhou, Dept Clin Lab, Zhengzhou, Peoples R China