1. National Center for Social Research, 61 Athinas and 9 Kratinou str, 10552 Athens, Greece
2. Department of Geography and Regional Planning, School of Rural and Surveying Engineering, National Technical University of Athens, Zographou Campus, Athens 15780, Greece
3. Department of Geography, Harokopio University, 70 El. Venizelou str, Kallithea, 17671 Athens, Greece