About the Authors
- Shangfang Dai
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Roles Data curation, Formal analysis, Investigation, Software, Validation, Writing – original draft
Affiliation School of Economics and Management, Tsinghua University, Beijing, China
- Litao Han
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Roles Conceptualization, Funding acquisition, Methodology, Supervision, Writing – review & editing
* E-mail: hanlitao@ruc.edu.cn
Affiliation School of Mathematics, Renmin University of China, Beijing, China
Competing Interests
The authors have declared that no competing interests exist.