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Authors
Huang, Zhi
Hu, Yu-ming http://orcid.org/0000-0003-2599-653X
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Article History
Received: 10 August 2019
Accepted: 18 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: The study procedure was approved by the ethics committee of Hunan Provincial Centre for Disease Prevention and Control. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
