1. Department of Accounting, Law and Finance, Grenoble Ecole de Management, 12 Rue Pierre Sémart, 38000Grenoble, France.
2. Faculty of Economics, Vrije Universiteit Brussel, Pleinlaan 2, 1050Bruxelles, Belgium.
3. Department of Mathematics, KU Leuven, Celestijnenlaan 200B, 3001Leuven, Belgium.