1. NOVA National School of Public Health, Public Health Research Centre, Comprehensive Health Research Center, CHRC, REAL, CCAL, NOVA University Lisbon , Lisbon, Portugal
2. Department of Public Health, FSPAC, Babeș-Bolyai University , Romania
3. Syreon Research Institute , Budapest, Hungary
4. Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen , Debrecen, Hungary