Huang, Ruixue
Ning, Huacheng
He, Tianfeng
Bian, Guolin
Hu, Jianan
Xu, Guozhang
Funding for this research was provided by:
Health and Medical Science and Technology Scheme of Zhejiang Province (2014KYA202)
the Science and Technology Scheme of Ningbo (2014C50027)
the Science and Technology Scheme of Health and Family Planning Commission of Hunan Province (BZ2016085)
Innovation Team of Science and Technology Bureau of Ningbo (2012B82018)
social development research program of Ningbo (2014C50025)
Science and technology innovation, science popularization guidance project of Hunan Province (2016ZK3002)
National Natural Science Foundation of China (81372966)
Article History
Received: 21 September 2017
Accepted: 19 June 2018
First Online: 1 July 2018
Compliance with ethical standards
:
: This study has been approved by the Institutional Review Board of the Ningbo Center for Disease Control. Data analyses were de-identified (number 201601).
: Not applicable.
: The authors declare that they have no conflicts of interest.
Free to read: This content has been made available to all.