Funding for this research was provided by:
Lanzhou Talent Innovation Entrepreneurship Project (2018-RC-73)
Received: 23 March 2020
Accepted: 17 July 2020
First Online: 28 July 2020
Ethics approval and consent to participate
: Not applicable.
: Written informed consent was obtained from the patient. This consent is for all potentially identifiable clinical data and accompanying images, and this is available for review by the editor of BMC surgery.
: The authors declare that they have no competing interests.