Funding for this research was provided by:
the Natural Science Fund of Shanghai Science and Technology Committee (17ZR1403400)
Received: 29 August 2020
Accepted: 7 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the review board and ethics committee of Obstetrics and Gynecology Hospital affiliated with Fudan University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
: All authors agree to be published.
: The authors declare that they have no competing interests.