1. Faculty of Economics, Porto University, 4200-464 Porto, Portugal
2. CiTUR, Centre for Tourism Research, Development and Innovation, 9000-082 Madeira, Portugal
3. Higher School of Technology and Management, University of Madeira, 9000-072 Funchal, Portugal
4. LIAAD, Institute for Systems and Computer Engineering, Technology and Science (INESC TEC), 4200-464 Porto, Portugal
5. Faculty of Applied Sciences, WSB University, 41-300 Dąbrowa Górnicza, Poland
6. College of Business and Economics, University of Johannesburg, Auckland Park, P.O. Box 524, Johannesburg 2006, South Africa