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Authors
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Funding
Funding for this research was provided by:
Natural Science Foundation of Shanxi ((201701D21059))
Project of Key Research Base of Humanities and Social Sciences in Shanxi Colleges and Universities ((20190130))
Art Science Planning Subject of Shanxi Province ((2017F06))
Xinzhou Platform and Specialized Talents ((20180601))
13th Five-year Plan of Education Science in Shanxi Province ((GH-17059))
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Article History
Received: 19 September 2019
Accepted: 22 January 2020
First Online: 29 January 2020
Competing interests
: The authors declare that they have no competing interests.
