Funding for this research was provided by:
Beijing Municipal Administration of Hospitals (QMS20191706)
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201705)
Article History
Received: 8 May 2020
Accepted: 2 June 2021
First Online: 11 June 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Ethic Committee (EC) from the Beijing Gynecology and Obsterics Hospital.
: Informed consent was obtained from all individual participants included in the study.