Funding for this research was provided by:
National Natural Science Foundation of China (81803334, 71774178)
Major Infectious Disease Prevention and Control of the National Science and Technique Major Project (2018ZX10715004, 2018ZX10715004, 2018ZX10715004)
Science and Technology Planning Project of Guangdong Province (2017A020212006)
Science and Technology Research Project of Guangzhou (201607010332, 201607010368)
Received: 13 July 2019
Accepted: 9 March 2020
First Online: 16 March 2020
Ethics approval and consent to participate
: Ethics approval was obtained from the ethics committee of Sun Yat-sen University ( 049). Written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.