Fu, Jianguang
Ai, Jing
Bao, Changjun
Zhang, Jun
Wu, Qingbin
Zhu, Liguo
Hu, Jianli
Xing, Zheng http://orcid.org/0000-0002-7288-0268
Funding for this research was provided by:
Innovative Research Group Project of the National Natural Science Foundation of China (81971923)
Article History
Received: 28 February 2021
Accepted: 12 May 2021
First Online: 26 May 2021
Declarations
:
: This research was approved by the Ethics Committee of the Jiangsu Provincial Center for Disease Control and prevention. The work is the summary and analysis of routine disease monitoring work, and there is no need for ethical approval. The content of the paper does not involve the privacy information of individual objects, which conforms to the ethical norms.
: Not applicable.
: The authors declare that they have no competing interests.