1. School of Internet Economics and Business, Fujian University of Technology, Fuzhou 350011, PR China
2. Faculty of Economics and Business, University of Murcia, Campus de Espinardo s/n, 30100, Spain
3. Department of Management and Business Administration, University of Pitesti, Romania
4. School of Statistics and Applied Mathematics, Anhui University of Finance and Economics, Bengbu 233030, PR China