Received: 23 June 2020
Accepted: 1 October 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: This article has been approved by the Institutional Review Board and Ethics Committee (Number 2019–32) of Obstetrics and Gynecology Hospital, Fudan University. We confirm that all patients have given consents for this surgical procedure.
: Not applicable.
: The author declares that there is no competing interest.