1. Department of Geography, Harokopio University of Athens, 17676 Kallithea, Greece
2. Department of Economics and Sustainable Development, Harokopio University of Athens, 17676 Kallithea, Greece
3. Department of Materials Science and Engineering, University of Crete, 70013 Heraklion, Greece
4. Department of Agriculture, Hellenic Mediterranean University, 71410 Heraklion, Greece