1. Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, H-4012 Debrecen, Hungary
2. Doctoral School of Health Sciences, University of Debrecen, H-4012 Debrecen, Hungary
3. Department of Financing, National Health Insurance Fund, H-1139 Budapest, Hungary
4. HUN-REN-DE Public Health Research Group, Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, H-4012 Debrecen, Hungary