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Authors
Cheng, Canchang
Wang, Qicai
Zhu, Minggu
Liu, Kelong
Zhang, Zhiqiao http://orcid.org/0000-0003-4631-8818
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Funding
Funding for this research was provided by:
Guangdong Provincial Health Department (A2016450, B2018237)
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Article History
Received: 19 February 2019
Accepted: 2 May 2019
First Online: 7 May 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.
