Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2016YFC0107105)
Received: 30 June 2020
Accepted: 28 December 2020
First Online: 3 February 2021
Ethics approval and consent to participate
: Theretrospective studywas approved by the Air Force Medical University, Tang Du Hospital Institutional Review Boardand the requirement for written informed consent was waived.(Study Nr.201510–013).
: Our manuscript does not contain any individual person’s data. (Not applicable).
: The authors declare no conflicts of interest.