1. School of Forestry and Natural Environment, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2. Department of Forestry and Management of the Environment and Natural Resources, Democritus University of Thrace, School of Agricultural and Forestry Sciences, Ath., Pantazidou 193, 68200 Orestiada, Greece
3. Research Centre of Tourism Sustainability and Well-Being, Campus de Gambelas, University of Algarve, 8005-139 Faro, Portugal