About the Authors

Xiaohang Zhang

zhangxiaohang@bupt.edu.cn

Affiliation School of Economics and Management, Beijing University of Posts and Telecommunications, Beijing, China

Zecong Zhang

Affiliation School of Economics and Management, Beijing University of Posts and Telecommunications, Beijing, China

Han Zhao

Affiliation School of Economics and Management, Beijing University of Posts and Telecommunications, Beijing, China

Qi Wang

Affiliation School of Economics and Management, Beijing University of Posts and Telecommunications, Beijing, China

Ji Zhu

Affiliation Department of Statistics, University of Michigan, Ann Arbor, Michigan, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XZ QW JZ. Performed the experiments: XZ ZZ HZ. Analyzed the data: XZ HZ ZZ. Contributed reagents/materials/analysis tools: XZ ZZ HZ. Wrote the paper: XZ QW JZ.