1. Department of Neurosurgery, St. Hedwig’s Regional Specialist Hospital, 45-221 Opole, Poland
2. Department of Neurosurgery, University Hospital, Institute of Medical Sciences, University of Opole, 45-040 Opole, Poland
3. Department of Neurology, St. Hedwig’s Regional Specialist Hospital, Institute of Medical Sciences, University of Opole, 45-040 Opole, Poland
4. Faculty of Electrical Engineering, Automatic Control and Informatics, Opole University of Technology, 45-758 Opole, Poland
5. Clinical Department of Diagnostic Imaging, Institute of Medical Sciences, University of Opole, 45-040 Opole, Poland
6. Department of Orthopedic Surgery Piekary Slaskie, 41-940 Piekary Śląskie, Poland
7. Department of Neurosurgery, Pomeranian Medical University Hospital No. 1, Unii Lubelskiej 1, 71-252 Szczecin, Poland
8. Department of Orthopedic Surgery, Okayama Rosai Hospital, Okayama 702-8055, Japan