1. Business School, Hohai University, Nanjing, Jiangsu, P.R. China
2. College of Economics and Management, Nanjing Forestry University, Nanjing, Jiangsu, P.R. China
3. School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Parkville, Australia
4. School of Management and Economics, Beijing Institute of Technology, Beijing, P.R. China