About the Authors

Tong Zhao

Roles Data curation, Formal analysis, Methodology, Writing – original draft, Writing – review & editing

tong_zhao@yeah.net

Affiliation School of Economics and Management, Yanshan University, Qinhuangdao, China

Zhijie Song

Roles Project administration

Affiliation School of Economics and Management, Yanshan University, Qinhuangdao, China

Tianjiao Li

Roles Data curation

Affiliation School of Economics and Management, Yanshan University, Qinhuangdao, China

Competing Interests

The authors have declared that no competing interests exist.