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Authors
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Funding
Funding for this research was provided by:
Natural Science Foundation of Shanxi Province ([grant number 201701D21059])
Project of Key Basic Research in Humanities and Social Sciences of Shanxi Colleges and Universities ((20190130))
Art and Science Planning Project of Shanxi Province ([grant number 2017F06])
Platform and Personnel Specialty of Xinzhou ((20180601))
Education Science Planning Project of the 13th Five-year Plan of the Key Discipline Project of Shanxi Province ([grant number GH-17059])
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Article History
Received: 22 July 2020
Accepted: 6 November 2020
First Online: 24 November 2020
Competing interests
: The authors declare that they have no competing interests.
