Du, Zhe
Chen, Qingjun
Lyu, Xinjun
Wang, Tianbing
Wang, Chuanlin http://orcid.org/0000-0003-1828-7153
Funding for this research was provided by:
National Natural Science Foundation of China (31771326)
Article History
Received: 8 April 2019
Accepted: 8 November 2019
First Online: 11 December 2019
Ethics approval and consent to participate
: Ethical clearance for this study was granted by the Ethic Committee of China Center for Disease Control and Prevention. We have received administrative permission to access and use these databases analyzed during the current study. All data analyzed in this study were anonymized.
: Not applicable.
: The authors declare that they have no competing interests.