1. Department of Neurosurgery, Postgraduate Medical Centre, 03‑242 Warsaw, Poland
2. Clinical Department of Neurosurgery, Central Clinical Hospital of the Ministry of the Interior and Administration, 02‑507 Warsaw, Poland
3. Faculty of Medical Sciences and Health Sciences, Kazimierz Pulaski University of Technology and Humanities Radom, 26‑600 Radom, Poland