Department of Obstetrics and Gynecology, Chinese PLA General Hospital, Beijing, China;2. Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Tangdu Hospital of the Fourth Military Medical University, Xian, China;3. Center for Reproductive Medicine, 900th Hospital of Joint Logistics Support Force of PLA, Fuzhou, China;4. Center for Reproductive Medicine, Guangdong Second Provincial General Hospital, Guangzhou, China;5. Department of Obstetrics and Gynecology, The Sixth Medical Center of PLA General Hospital, Beijing, China;6. Reproductive and Genetic Medicine Center, Dalian Municipal Women and Children's Medical Center, Dalian, China;7. Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Nanfang Hospital, Southern Medical University, Guangzhou, China;8. Centre for Women, Children and Reproduction, The 924th Hospital of Joint Logistic Support Force of PLA, Guilin, China;9. Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Southwest Hospital, Chongqing, China;10. Reproductive Endocrinology and Infertility Center, Peking University People's Hospital, Beijing, China;11. Department of Assisted Reproductive Technology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China;12. Department of Reproduction Medicine, General Hospital of Northern Theater Command, Shenyang, China;13. Genetics and Precision Medicine Center, The First People's Hospital of Kunming, Kunming, China;14. Department of Obstetrics and Gynecology, Chinese PLA General Hospital, Beijing, China