Funding for this research was provided by:
Beijing Municipal Administration of Hospitals (XXZ01)
the foundation of Aero Space Central Hospital (YN201710)
Received: 26 March 2019
Accepted: 15 October 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of the Aerospace Central Hospital. The committee’s reference number is 20161228-YN-09.
: All patients participating in this study signed informed consent. The data and images used in this study were agreed by the patients themselves.
: The authors declare that they have no competing interests.