Wang, Hao
Du, Huaidong
Bragg, Fiona
Zhong, Jieming
Yu, Min
Funding for this research was provided by:
Ministry of Science and Technology (2016YFC0900502)
Article History
Received: 4 July 2018
Accepted: 5 December 2018
First Online: 27 December 2018
Ethics approval and consent to participate
: The study is approved by the ethics committee of Zhejiang Provincial Centre for Disease Control and Prevention. Written consent form was given to all students and their guardians in the 2 weeks prior to the survey, and was collected after their signature. The students will not be investigated, if they or their guardians refused to sign their names.
: Not applicable.
: The authors declare that they have no competing interests.
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