Zhou, Ping-Ping
Yu, Guolong
Kuang, Yi-Qun
Huang, Xu-He
Li, Yan
Fu, Xiaobing
Lin, Peng
Yan, Jin
He, Xiang http://orcid.org/0000-0003-2428-5349
Funding for this research was provided by:
Ministry of Science and Technology of the People's Republic of China (2012ZX10004-902)
Health and Family Planning Commission of Guangdong Province
Article History
Received: 5 February 2018
Accepted: 7 February 2019
First Online: 22 February 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board for Medical Research of Guangdong Provincial Center for Disease Control and Prevention (No. 2016031), and informed consent from the participants was waived.
: Not applicable.
: The authors declare that they have no competing interests.
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