1. Reproductive Medicine Center, Department of Gynecology and Obstetrics, Peking University International Hospital, Beijing, China
2. Department of Reproduction and Genetics, Tangshan Maternity and Child Health Care Hospital, Tangshan, China
3. Reproductive Medicine Centre, Department of Gynecology and Obstetrics, Key Laboratory of Birth Defects and Related Diseases of Women and Children Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, China
4. Department of Urology, Beijing Tongren Hospital, Capital Medical University, Beijing, China
5. Department of Internal Medicine-Neurology, General Hospital of Jizhong Energy Xingtai Mining Group Co. Ltd., Xingtai, China
6. Department of Andrology, Fucheng Technical Service Center of Family Planning, Hengshui, China
7. Department of Andrology, Nanjing General Hospital of Nanjing Command, PLA, Nanjing, China
8. Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
9. National Health and Family Planning Key Laboratory of Male Reproductive Health, Department of Male Clinical Research, National Research Institute for Family Planning, Beijing, China