1. School of Business Administration, University of Patras, Agrinio, Greece; e-mail: argkolokon@upatras.gr (corresponding author).
2. School of Business Administration, University of Patras, Agrinio, Greece; e-mail: akontoge@upatras.gr
3. Department of Regional and Cross Border Development, University of Western Macedonia, Kozani, Greece; e-mail: eloizou@uowm.gr
4. Department of of Regional and Cross Border Development, University of Western Macedonia, Kozani, Greece; e-mail: fxtheodoridis@uowm.gr.