Wang, Weihua
Qiu, Lin
Sa, Rina
Dang, Shaonong
Liu, Feng
Xiao, Xiang
Article History
Received: 15 May 2020
Accepted: 28 June 2021
First Online: 10 July 2021
Declarations
:
: All enrolled participants in the monitoring program gave written informed consent for participation. The Ethics Committee of the Chinese Center for Disease Control and Prevention approved the implementation of the program.
: Not applicable.
: The authors declare that they have no competing interests.