1. Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou, PR China
2. Lanzhou Municipal Center for Disease Control, Lanzhou, PR China
3. School of Stomatology Lanzhou University, Lanzhou University, Lanzhou PR China
4. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, PR China
5. The First People’s Hospital of Lanzhou City, Lanzhou, PR China
6. The Reproductive Medicine Hospital of the First Hospital of Lanzhou University, Lanzhou University, Lanzhou, PR China
7. The Second People’s Hospital of Lanzhou City, Lanzhou, PR China
8. College of Life Sciences, University of Chinese Academy of Sciences, Beijing, PR China
9. The Institute of Reproductive Medicine Center, Gansu Provincial Maternity and Child–care Hospital, Lanzhou, PR China