Funding for this research was provided by:
the National Key Research and Development Program of China (2019YFA0802302)
the National Key Research and Development Program of China (2019YFA0802300)
State Key Project on Infectious Diseases of China (2018ZX10723204)
Received: 7 June 2020
Accepted: 1 September 2020
First Online: 22 October 2020
Ethics approval and consent to participate
: The Ethics Committee for Clinical Research of LMUFAH approved the ethics of the study.
: Informed consent was waived by the above ethics committee due to the retrospective nature of the study.
: The authors declared no conflict of interest.