Funding for this research was provided by:
National Natural Science Foundation of China (81772955)
Natural Science Foundation of Shanghai (17ZR1439300)
Scientific Research Program of Shanghai Municipal Commission of Health and Family Planning (201640269)
Received: 24 September 2020
Accepted: 9 November 2020
First Online: 24 November 2020
Ethics approval and consent to participate
: The study did not need ethics approval.
: Not applicable
: The authors declare that they have no competing interests.