Funding for this research was provided by:
National Key R&D Program of China (2018YFC1005001)
The Foundation of Science and Technology Commission of Shanghai Municipality (17JC1420103)
Shanghai Municipal Science and Technology Major Project (2017SHZDZX01)
Youth Program of National Natural Science Foundation of China (31801252)
Health and Family Planning Commission of Sichuan Province (20204Y0276)
Shanghai Municipal Health Commission Scientific Research Project (201640369)
Received: 14 January 2021
Accepted: 20 July 2021
First Online: 30 July 2021
: The study was approved by the Ethics Committee and Institutional Review Board of Shanghai Institute of Planned Parenthood Research. All the study participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.