Funding for this research was provided by:
the Shanxi Planning Office of Philosophy and Social Sciences (2019B091)
Article History
Received: 9 May 2021
Accepted: 25 August 2021
First Online: 8 September 2021
Declarations
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: Not applicable.
: Not <b>a</b>pplicable.
: Not applicable.
: The authors declare no competing interests.
: The views of this paper are only from the authors and do not necessarily represent the official views of the sponsors. We would like to appreciate the anonymous reviewers for their valuable comments.