Published on in Vol 6, No 1 (2022): January
1 The George Institute for Global Health at Peking University Health Science Center, Beijing, China
2 Faculty of Medicine, University of New South Wale, Sydney, Australia
3 Tianjin University of Traditional Chinese Medicine, Tianjin, China
4 Shijiazhuang Obstetrics and Gynaecology Hospital, Shijiazhuang, China
5 Shijiazhuang Luquan People's Hospital, Shijiazhuang, China
6 Department of Anesthesiology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing, China
7 Gaoyang Maternal and Child Health Hospital, Baoding, China
8 Nuffield Department of Women’s & Reproductive Health, University of Oxford, Oxford, United Kingdom
9 The George Institute for Global Health, Central Working - Fourth Floor Translation and Innovation Hub Imperial College London, London, United Kingdom
*these authors contributed equally