1. Department of Neurology Faculty of Medicine Safarik University Kosice Slovakia
2. Department of Neurology University Hospital L. Pasteur Kosice Slovakia
3. Graduate School Kosice Institute for Society and Health Faculty of Medicine Safarik University Kosice Slovakia
4. Department of Neurology University Medical Center Groningen University of Groningen Groningen The Netherlands
5. Department of Neurology University Hospital in Martin Martin Slovakia
6. Department of Neurology Jessenius Faculty of Medicine Comenius University in Bratislava Martin Slovakia
7. Department of Community and Occupational Medicine University Medical Center GroningenUniversity of Groningen Groningen The Netherlands