1. Unit of Biostatistics, Epidemiology and Research Methods, Department of Nutrition and Dietetics, School of Health Sciences and Education, Harokopio University, Athens, Greece;
2. Unit of Biostatistics, Department of Nutrition and Dietetics, School of Physical Education, Sport Science and Dietetics, University of Thessaly, Trikala, Greece;
3. Department of Geography, School of Environment, Geography and Applied Economics, Harokopio University, Athens, Greece