About the Authors
- Tong Zhao
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Roles Data curation, Formal analysis, Methodology, Writing – original draft, Writing – review & editing
* E-mail: tong_zhao@yeah.net
Affiliation School of Economics and Management, Yanshan University, Qinhuangdao, China
- Zhijie Song
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Roles Project administration
Affiliation School of Economics and Management, Yanshan University, Qinhuangdao, China
- Tianjiao Li
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Roles Data curation
Affiliation School of Economics and Management, Yanshan University, Qinhuangdao, China
Competing Interests
The authors have declared that no competing interests exist.