1Department of Neurology, Regional Hospital and Faculty of Health Studies, University of Pardubice, 44 Kyjevská, 532 03, Pardubice, Czech Republic
2Department of Occupational Medicine, 1st Faculty of Medicine, Charles University, and General University Hospital, Praha, Czech Republic
3Department of Neurology, Thomayer University Hospital, Praha, Czech Republic
4National Institute of Public Health, Praha, Czech Republic
5Department of Neurology, 2nd Faculty of Medicine, Charles University, and University Hospital Motol, Praha, Czech Republic
6Department of Occupational Medicine, Faculty of Medicine and Dentistry, Palacký University, and University Hospital, Olomouc, Moravia
7Department of Neurology, Faculty of Medicine, Charles University, Hradec Králové, Czech Republic
8Department of Neurology, Faculty of Medicine and Dentistry, Palacký University, and University Hospital, Olomouc, Moravia