1. Associate Professor, School of Management Science and Engineering, Central University of Finance and Economics, Beijing 100081, PR China
2. PhD student, School of Management Science and Engineering, Central University of Finance and Economics, Beijing 100081, PR China
3. Professor, School of Management Science and Engineering, Central University of Finance and Economics, Beijing 100081, PR China
4. Assistant Professor, School of Public Administration and Policy, Renmin University of China, Beijing 100872, PR China