1. Department of Agriculture, Food and Environment, University of Pisa, Via del Borghetto, 80, 56124 Pisa, Italy
2. Department of Education, Cultural Heritage and Tourism, University of Macerata, P.le Bertelli, 1, 62100 Macerata, Italy
3. School of Business Economics, UiT-The Arctic University of Norway, NO-9037 Tromsø, Norway