1. Department of Tourism Administration, Faculty of Managerial Sciences, Hisar Campus, Boğaziçi University, 34342 Istanbul, Turkey
2. Department of Management, Economics and Industrial Engineering, Polytechnic of Milan, Via Raffaele Lambruschini 4/B, 20156 Milan, Italy
3. Department of Cultures, Politics and Society, University of Turin, Lungo Dora Siena 100 A, 10153 Turin, Italy