Funding for this research was provided by:
the CAMS Initiative for Innovative Medicine of China (2016-I2M-2-006)
National Mega Projects of China for Major Infectious Diseases (2017ZX10304402)
Article History
Received: 18 March 2020
Accepted: 23 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.