Funding for this research was provided by:
Research project of Jiangsu Provincial natural science foundation (BK20151595)
Jiangsu Provincial Medical Youth Talent (QNRC2016542)
Jiangsu Provincial Major Science & Technology Demostation Project (BE2017749)
Received: 23 January 2019
Accepted: 10 September 2019
First Online: 7 October 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee at Jiangsu Provincial Center for Disease Control and Prevention, China (No. JSCDC20190301). As the HFMD incidence was statistical summary data, it was not necessary to obtain informed consent.
: Not applicable.
: The authors declare that they have no competing interests.