You, Enqing
Wang, Ling
Zhang, Lei
Wu, Jinju
Zhao, Kefu
Huang, Fen http://orcid.org/0000-0003-2127-3668
Funding for this research was provided by:
Hefei Centers for Disease Control and Prevention
Article History
Received: 20 July 2020
Accepted: 2 November 2020
First Online: 13 November 2020
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: This study was approved by the Ethics Committee of Hefei Center for Diseases Control and Prevention.
: All participants signed a written informed consent form prior to participating.