1. Faculty of Applied Economics, Marketing Department, University of Antwerp, Prinsstraat 13, 2000 Antwerp, Belgium
2. Faculty of Applied Economics, Marketing Department, University of Antwerp & Antwerp Management School, Prinsstraat 13, office B.236, 2000 Antwerp, Belgium
3. Faculty of Applied Economics, Marketing Department, University of Antwerp, Prinsstraat 13, 2000 Antwerp, Belgium, and Faculty of Economics and Business Administration, Department of Marketing, Ghent University, Tweekerkenstraat 2 9000 Ghent, Belgium
4. Department of Biosystems, KU Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium, and Faculty of Applied Economics, Department of Engineering Management, Prinsstraat 13, 2000 Antwerp, Belgium