1. Faculty of Economics and Business, University of Groningen, Nettelbosje 2, 9747 AE Groningen, The Netherlands
2. Department of Economics, Lund University, Box 7082, 220 07 Lund, Sweden
3. Centre for Financial Econometrics, Deakin Business School, Deakin University, 221 Burwood Highway Burwood, Victoria 3125, Australia