1. Department of Health Management Center & Institute of Health Management, Sichuan Provincial People’s Hospital, University of Electronic Science and Technology of China , No. 32 West Second Section, First Ring Rd., Qingyang Dist., Chengdu 610072 , China
2. Department of School of Public Health, and Epidemiology and Biostatistics, Zhejiang University School of Medicine , Hangzhou , China
3. Department of Gynaecology, Lishui Hospital of Traditional Chinese Medicine, Lishui , China
4. School of Public Health, Southwest Medical University , Luzhou , China
5. Obstetrics and Gynecology Hospital, Institute of Reproduction and Development, Fudan University , Shanghai , China
6. Research Units of Embryo Original Diseases, Chinese Academy of Medical Sciences, Shanghai, China
7. Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital , Beijing , China
8. UNSW Microbiome Research Centre, St George and Sutherland Clinical Campuses, UNSW Sydney , Sydney , Australia
9. Department of Obstetrics and Gynecology, The First People’s Hospital of Foshan , No. 81, Lingnan Avenue North, Chancheng District, Foshan City, Guangdong Province 528000 , China