Sun, Mingming
Jiang, Wei
Article History
Received: 14 February 2023
Accepted: 30 March 2023
First Online: 1 April 2023
Declarations
:
: This retrospective study was conducted following a protocol (2021–81) approved by the ethics committee of the Obstetrics and Gynecology Hospital of Fudan University in accordance with the 1964 Helsinki Declaration. Each participant gave a consent at enrolment.
: Not applicable.
: The authors declare that they have no conflicts of interest.