Wang, Xin
Guo, Yinshu
Article History
Received: 7 January 2022
Accepted: 25 February 2022
First Online: 4 March 2022
Declarations
:
: The Ethics Committee of The Beijing Obstetrics and Gynecology Hospital of Capital Medical University approved the study protocol (No. IEC-B-03-V01-FJ1), which was performed in compliance with the Helsinki Declaration. Written informed consent was obtained from all of the patients.
: Not applicable.
: The authors declare that they have no competing interests.