1. Department of Neurology; Safarik University; Kosice Slovak Republic
2. Department of Neurology; L. Pasteur University Hospital; Kosice Slovak Republic
3. Graduate School Kosice Institute for Society and Health; Safarik University; Kosice Slovak Republic
4. Department of Social Medicine; Institute of Public Health; Safarik University; Kosice Slovak Republic
5. Department of Community and Occupational Health; University Medical Center Groningen; Groningen The Netherlands