Funding for this research was provided by:
Ministry of Science and Technology of the People's Republic of China (2018ZX10713001)
National Natural Science Foundation of China (91846302)
Received: 21 December 2020
Accepted: 5 March 2021
First Online: 12 April 2021
Change Date: 2 June 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/s40249-021-00868-7
: The information in our study were from NNDRS and COVID-19 case reporting system. Analyses of these data are routine work, which are involved with relative divisions in China CDC.
: Written informed consent was obtained from the participants for the publication of this paper.
: The authors declare that they have no competing interests.