Chen, Hongguang https://orcid.org/0000-0001-6716-5393
Wang, Tingwei
Liu, Lin
Wang, Donglin
Cheng, Qingxue
Article History
Received: 29 June 2018
Accepted: 14 January 2019
First Online: 30 January 2019
Ethics approval and consent to participate
: Written informed consent forms were obtained from all subjects.Medical Research Coordinating Committee of Yulin CDC approved the study.
: Not applicable.
: The authors declare that they have no competing interests.
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