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Authors
Wang, Shuai http://orcid.org/0000-0003-4409-0581
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Funding
Funding for this research was provided by:
"Thirteen Five" Scientific and Technological Research Planning Project of the Department of Education of Jilin Province (JJKH20170301KJ)
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Article History
Received: 12 March 2018
Accepted: 6 July 2018
First Online: 18 July 2018
Competing interests
: The author has no competing interests. There is no conflict of interest exists in the submission of this manuscript.
