1. Department of Mathematics, University of Utah, Salt Lake City, USA;
2. School of Finance, Renmin University of China, Beijing, China;
3. China Financial Policy Research Center, Renmin University of China, Beijing, China;
4. CERGAM, Aix-Marseille University, Aix-en Provence, France;
5. Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, Canada;
6. Department of Economics, University of Reading, Reading, UK;
7. China Capital Market Institute, Shenzhen, China