1. Departament d’Economia Aplicada, Universitat de les Illes Balears, Palma de Mallorca, Spain
2. Griffith Institute for Tourism, Griffith University, Griffith, Australia
3. Models for Information Processing and Fuzzy, Information (MOTIBO) Research group, Balearic Islands Health Research Institute, Idisba, Spain
4. Departamento de Métodos Cuantitativos, Colegio Universitario de Estudios Financieros (CUNEF), Madrid, Spain