1. 1Department of Hygiene and Epidemiology, Faculty of Medicine, University of Thessaly, 22 Papakiriazi Str., 41222 Larissa, Greece
2. 2National School of Public Health, Olympic Planning Unit, 196 Alexandras Avenue, 115 21 Athens, Greece
3. 3Technological Educational Institute of Kalamata, Antikalamos 24100, Kalamata, Greece
4. 4Department of Agriculture, Ichthyology and Aquatic Environment, Agricultural Sciences, University of Thessaly, Fitokou Str., N. Ionia, 384 46 Volos, Greece