1. School of Economics, Guangzhou College of Commerce, Guangzhou 511363, P. R. China
2. Postdoctoral Programme of Bank of Communications, Shanghai 200000, P. R. China
3. School of Business Administration, Dongbei University of Finance and Economics, Dalian 116025, P. R. China
4. Graduate School of Business, The National University of Malaysia Bangi 43600, Selangor, Malaysia
5. School of Cultural Tourism and Geography, Guangdong University of Finance & Economics, Guangzhou 510320, P. R. China