Alexandra Tragaki1, Demosthenes Panagiotakos2. 1. Department of Geography, School of Environment, Geography and Applied Economics, Harokopio University, Athens, Greece. 2. Department of Nutrition and Dietetics, School of Health Science and Education, Harokopio University, Athens, Greece; Faculty of Health, University of Canberra, Australia; School of Allied Health, College of Science, Health and Engineering, LA TROBE University, Australia. Electronic address: d.b.panagiotakos@usa.net.