1. School of Basic Medical Sciences, Evidence-Based Medicine Center, Lanzhou University, No 199, Donggang West Road, Chengguan District , Lanzhou 730000, P. R. China
2. Department of Pharmacology, School of Basic Medical Science, Lanzhou University , Lanzhou 730000, P. R China
3. Reproductive Medicine Center, Gansu Provincial Maternity and Child-Care Hospital , Lanzhou 730000, P. R. China
4. Center for Medical Device Evaluation, National Medical Products Administration , Beijing 100081, P.R China
5. Key Laboratory of Evidence-Based Medicine and Knowledge Translation of Gansu Province , Lanzhou 730000, P. R. China