1. University of Sydney, Sydney, New South Wales 2006, Australia
2. Korea University Business School, Seoul 136-701, Korea
3. Faculty of Business and Economics, The University of Hong Kong, Hong Kong SAR, China
4. Temple University, Hayesville, North Carolina 28904;
5. Ivey Business School, Western University, London, Ontario N6G 0N1, Canada;
6. Institute for Artificial Intelligence and Software, SoonChunHyang University, Asan-si 31538, Korea