1. ELKH-DE Public Health Research Group, Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
2. Epidemiology and Surveillance Centre, Semmelweis University, 1085 Budapest, Hungary
3. Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
4. Department of Public Health, Semmelweis University, 1089 Budapest, Hungary