1. Department of Neurosurgery, J. E. Purkyně University, Masaryk Hospital, 401 13 Ústí nad Labem, Czech Republic
2. Department of Neurosurgery, University Hospital in Pilsen, The Faculty of Medicine in Pilsen, Charles University in Prague, 323 00 Pilsen, Czech Republic
3. Department of Neurology, Masaryk Hospital, 401 13 Ústí nad Labem, Czech Republic