1. Reproductive Medicine Center, The affiliated Children’s Hospital of Shanxi Medical University, Children’s Hospital of Shanxi and Women Health Center of Shanxi, Taiyuan, Shanxi, P.R.China
2. First Hospital of Shangxi Medical University, Taiyuan, Shanxi, P.R. China
3. Department of Clinical Laboratory, Shanxi Provincial People’s Hospital (Fifth Hospital) of Shanxi Medical University, Taiyuan, P.R.China