1. School of Management and Economics, Beijing Institute of Technology, Beijing, P. R. China
2. Department of Management Sciences, COMSATS University Islamabad, Vehari Campus, Vehari, Punjab, Pakistan
3. School of Computer Science and Telecommunication Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
4. Department of Marketing, School of Business, University of International Business and Economics, Chaoyang District, Beijing, P. R. China