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Authors
Cheng, Weibin https://orcid.org/0000-0002-9845-6676
Xu, Huifang
Tang, Weiming
Zhong, Fei
Meng, Gang
Han, Zhigang
Zhao, Jinkou
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Funding
Funding for this research was provided by:
Guangzhou Medical Scientific Research Foundation (201102A211001)
Guangzhou Medical Scientific Research Foundation (20121A011123)
the National Science and Technology Major Project (2018ZX10715004)
Guangzhou Municipal Science and Technology Project (201607010332)
Guangzhou Municipal Science and Technology Project (201707010184)
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Article History
Received: 1 September 2018
Accepted: 3 July 2019
First Online: 19 July 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of Guangzhou Center for Disease Control and Prevention in January 15, 2009 (Approved No. of ethic committee: GZCDC2009003). Consents were obtained from all participants by using an online ‘click to consent’ procedure.
: Not applicable.
: The authors declare that they have no competing interests.
