Luo, Jing
Chen, Qian
Shen, Tianran
Wang, Xu
Fang, Wanjun
Wu, Xiaocai
Yuan, Zenan
Chen, Gengdong
Ling, Wenhua http://orcid.org/0000-0002-5468-6605
Chen, Yuming
Funding for this research was provided by:
Guangzhou science and technology project (42050027)
Article History
Received: 25 June 2018
Accepted: 15 October 2018
First Online: 8 November 2018
Ethics approval and consent to participate
: Written informed consent was provided by all participants, and the study was approved by the Ethics Committee of the School of Public Health at Sun Yat-sen University (Approval Number ZDGWYL2009–3, Registration Number NCT03179657, ExternalRef removed), which meets the ethical standards established in the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
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