1. Department of Business Administration, University of Western Macedonia, 51100 Grevena, Greece
2. Department of Agriculture, Faculty of Agricultural Sciences, University of Western Macedonia, 53100 Florina, Greece
3. Department of Regional and Cross-Border Development, University of Western Macedonia, 50100 Kozani, Greece
4. Department of Dynamic Tectonic Applied Geology, Faculty of Geology and Geoenvironment, School of Sciences, National and Kapodistrian University of Athens, 15784 Athens, Greece