1. Department of Neurolog, School of Health Sciences in Katowice, Medical University of Silesia, Katowice, Poland
2. Department of Neurology, Professor Leszek Giec Upper Silesian Medical Centre, Medical University of Silesia Hospital No. 7, Katowice, Poland
3. Department of Radiation Oncology and Chemotherapy, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice, Poland