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Authors
Dong, Dong
Lou, Peian https://orcid.org/0000-0001-7551-0206
Wang, Jian
Zhang, Pan
Sun, Jianquan
Chang, Guiqiu
Xu, Chunrong
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Article History
Received: 4 February 2019
Accepted: 19 May 2020
First Online: 24 May 2020
Ethics approval and consent to participate
: Written informed consent was obtained from all the participants. The study protocol was approved by the Xuzhou Center for Disease Control and Prevention (2011710). The procedures followed were in accordance with the standards of the ethics committee of Xuzhou Center for Disease Control and Prevention and with the Declaration of Helsinki (1975, revised 2013).
: Not applicable.
: The authors declare that they have no competing intrests..
