Received: 26 September 2020
Accepted: 24 January 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Seventh Affiliated Hospital of Sun yet-san University (The certificate number was 2020SYSUSH-055). Professor Tian Li, who is the chief of the Centre of Pelvic Floor Rehabilitation of Gynaecology and Obstetric Department in the Seventh Affiliated Hospital of Sun yet-san University, and Hui Fei, Yun Liu were allowed to access and use the medical records described in this study.
: Not applicable.
: The authors declare that they have no competing interests.