Received: 4 November 2020
Accepted: 6 May 2021
First Online: 26 May 2021
: The study was approved by the ethics committee of The General Hospital of Northern Theater Command (k2017-26), and all patients signed informed consent forms.
: All participants provided written informed consent. Written consent for publication has been obtained from the patients shown in the figures.
: The authors declare no potential conflicts of interest.