Funding for this research was provided by:
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201705)
Received: 2 September 2021
Accepted: 9 November 2021
First Online: 24 January 2022
: This study was conducted with the approval of the Beijing Obstetrics and Gynecology Hospital, Capital Medical University. Beijing Maternal and Child Health Care Hospital, Institutional Review Board (IRB) Committee on Human Research in the Medical Sciences (CHRMS). A written informed patient consent was signed by each patient before joining this study project.
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.