1 Department of Forestry and Management of the Environment and Natural Resources, Democritus University of Thrace, 193 Pantazidou Street, 68200, Orestiada, Greece.
2 Research Centre for Tourism, Sustainability and Well-being, University of Algarve, Gambelas Campus, 8005, Faro, Portugal.
3 Department of Forestry and Natural Resources, Aristotle University of Thessaloniki, Greece.