Tang, Chengxiang
Wu, Xueji
Chen, Xiongfei
Pan, Bingying
Yang, Xiaocong
Funding for this research was provided by:
NSFC (71704143)
Department of Science and Technology of Sichuan Province (2018JZ0053)
Article History
Received: 27 February 2018
Accepted: 12 February 2019
First Online: 21 February 2019
Ethics approval and consent to participate
: Ethics approval has been obtained from the Ethics Committee of Guangzhou CDC. The reference number is GZCDC-2013006. The participants read the written informed consent and verbally agreed to join the survey.
: Not applicable.
: The authors declare that they have no competing interests.
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