1. International Institute of Finance, School of Management, University of Science and Technology of China, Hefei 230052, China;
2. Information Systems, Statistics, and Management Science, Culverhouse College of Business, The University of Alabama, Tuscaloosa, Alabama 35487;
3. HKU Business School, The University of Hong Kong, Hong Kong;
4. Department of Informatics, Ionian University, Corfu 491 00, Greece