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Authors
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Funding
Funding for this research was provided by:
funding of Social Science Planning Project of Shandong Province (16CQXJ07)
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Article History
Received: 27 November 2019
Accepted: 27 August 2020
First Online: 3 September 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.
