1. Faculty of Social Sciences, University of Duisburg-Essen, Duisburg 47057, Germany;
2. Department of Management, University of Toronto Scarborough, Scarborough, Ontario M1C 1A4, Canada;
3. Rotman School of Management, University of Toronto, Toronto, Ontario M5S 3E6, Canada;
4. Haskayne School of Business, University of Calgary, Calgary, Alberta T2N 1N4, Canada