Liu, Yunyong
Jiang, Chao
Li, Siyao
Gu, Yuan
Zhou, Yan
An, Xiaoxia
Zhao, Li
Pan, Guowei
Funding for this research was provided by:
Science and Technology Department of Liaoning Province (2008225001)
Article History
Received: 3 January 2018
Accepted: 12 June 2018
First Online: 4 July 2018
Ethics approval and consent to participate
: The study was conducted in accordance with the Declaration of Helsinki on ethical principles for medical research involving human subjects. The ethics committee of Liaoning Provincial Center for Disease Control and Prevention (LNCDCP) approved the study. All subjects gave written informed consent after the study objectives were explained, and all subjects were free to withdraw at any time without giving any reason.
: Not applicable in this section.
: The authors declare that they have no competing interests.
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