Tian, Ting
Zhang, Jingxian
Zhu, Qianrang
Xie, Wei
Wang, Yuanyuan
Dai, Yue
Article History
Received: 6 March 2020
Accepted: 23 August 2020
First Online: 31 August 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of the Jiangsu provincial center for disease control and prevention, and reference number was No. JSCDC2014236. All participants had signed the informed consent on this study.
: Not applicable.
: The authors declare no conflict of interest.