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Authors
Chen, Dongzhen
Lu, Hua
Zhang, Shengyang
Yin, Jia
Liu, Xuena
Zhang, Yixin
Dai, Bingqin
Li, Xiaomei
Ding, Guoyong
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Article History
Received: 10 February 2021
Accepted: 20 April 2021
First Online: 1 May 2021
Declarations
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: Disease surveillance data used in this study were obtained from the China Information System for Disease Control and Prevention with the approval by Shandong CDC. All data are unidentified. The present study was reviewed by the research institutional review board of Shandong First Medical University, and it is found that utilization of disease surveillance did not require oversight by an ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.
