1. Department of Hygiene & Epidemiology, Faculty of Medicine, School of Health Sciences, University of Ioannina, 45110 Ioannina, Greece
2. Department of Nutrition and Dietetics, School of Health Sciences and Education, Harokopio University, 17676 Kallithea, Greece
3. 1st Propaedeutic Department of Medicine, General Hospital of Atherns ‘Laiko’, School of Medicine, National and Kapodistrιan University of Athens, 11527 Athens, Greece