Funding for this research was provided by:
National Natural Science Foundation of China (81372048)
Received: 28 June 2020
Accepted: 29 October 2020
First Online: 7 November 2020
Ethics approval and consent to participate
: Authorization of the ethical board was not required for this retrospective investigation, but signed consent for surgical treatment and research purposes was obtained before surgical procedures.
: Not applicable.
: The authors declare no conflicts of interest in association with the present study.