Funding for this research was provided by:
the Key Discipline Construction Project of Pudong New Area Health and Family Planning Commission (PWZxk2017-26)
Health and Family Planning Committee of Pudong New Area (PWRl2017-04)
the Science and Technology Development Fund of Pudong New Area (PKJ2017-Y23)
Received: 18 November 2020
Accepted: 10 August 2021
First Online: 19 August 2021
: The study complied with the declaration of Helsinki and was approved by the ethics committee of Gongli hospital. Committee’s Reference number:  Pro-Trial No. (010); Informed consent was waived since the study had no risk and would not adversely affect the subjects’ rights or welfare.
: Not applicable.
: There is no conflict of interest among all the authors.