Article History
Received: 16 August 2021
Accepted: 16 January 2022
First Online: 1 February 2022
Declarations
:
: All patients participating in the study were informed consent. The ethics committee of Obstetrics and Gynecology Hospital of Fudan University approved this study. The experimental guidelines for this study were developed in accordance with the declaration of the World Medical Association in Helsinki.
: Agree.
: The authors declare that they have no competing interests.