Wang, Hao
Hu, Ruying
Du, Huaidong
Fiona, Bragg
Zhong, Jieming
Yu, Min
Funding for this research was provided by:
Ministry of Science and Technology of the People's Republic of China (2016YFC0900502)
Article History
Received: 25 April 2018
Accepted: 26 June 2018
First Online: 9 July 2018
Ethics approval and consent to participate
: This study was approved by the ethics committee of Zhejiang Provincial Centre for Disease Control and Prevention. The institutional review board approved this procedure. Written informed consent was obtained from all students and their guardians.
: Not applicable.
: The authors declare that they have no competing interests.
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