1. Business School, Central South University, Changsha, Hunan, People's Republic of China
2. School of Economics, Nankai University, Tianjin, People's Republic of China
3. Department of Finance, Accounting and Economics, University of Pitesti, Pitesti, Arges, Romania
4. Institute of Doctoral Studies, Lucian Blaga University of Sibiu, Sibiu, Romania
5. School of Statistics and Applied Mathematics, Anhui University of Finance and Economics, Bengbu, People's Republic of China