1. College of Economics and Management, Nanjing University of Aeronautics and Astronautics, Nanjing, PR China ;
2. Business School, University of International Business and Economics, Beijing, PR China
3. Research Center for Labor Economics and Human Resources, Shandong University, Weihai, PR China
4. Business School, Shanghai Jian Qiao University, Shanghai, PR China
5. Department of Economics, Ghazi University, DG Khan, Pakistan
6. Faculty of Economics and Administrative Science, Karadeniz Technical University, Turkey