About the Authors
- Fang Fu
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Affiliation School of Economics & Management of China University of Petroleum (East China), Qingdao, Shandong, PR China
- Tao Zhang
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* E-mail: zhangtao@upc.edu.cn
Affiliation School of Economics & Management of China University of Petroleum (East China), Qingdao, Shandong, PR China
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceptualization: FF. Funding acquisition: FF. Investigation: TZ. Methodology: FF. Project administration: TZ. Writing – original draft: FF. Writing – review & editing: TZ.