Mei, Xin
Zhong, Qing
Chen, Gong
Huang, Yuanxia
Li, Junlin
Article History
Received: 27 October 2019
Accepted: 8 September 2020
First Online: 17 September 2020
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of the Wuhan Center for Disease Control and Prevention. Written informed consent was obtained from all participants and a parent or guardian of participants aged less than 17 years.
: Not applicable.
: The authors have no competing interests to declare.