1. Department of Social and Behavioural Medicine, Faculty of Medicine, PJ Safarik University in Kosice, Kosice, Slovakia
2. Graduate School Kosice Institute for Society and Health, PJ Safarik University in Kosice, Kosice, Slovakia
3. Department of Health Sciences, Community & Occupational Medicine, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
4. Department of Pneumology and Phtiseology, Faculty of Medicine, PJ Safarik University in Kosice, Kosice, Slovakia