About the Authors
- Siliang Guo
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Roles Conceptualization, Supervision, Writing – original draft
* E-mail: gsl200601@126.com
Affiliation School of Economics and Management, Qilu Normal University, Jinan, China
- Yanhua Diao
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Roles Conceptualization, Funding acquisition, Writing – original draft, Writing – review & editing
Affiliation School of Economics and Management, Shandong Youth University of Political Science, Jinan, China
Competing Interests
The authors have declared that no competing interests exist.