1Department of Neurology, University Clinical Centre Tuzla, 75000 Tuzla, Bosnia and Herzegovina
2Department of Orthopaedics and Traumatology, University Clinical Centre Tuzla, 75000 Tuzla, Bosnia and Herzegovina
3Department of Neurosurgery, University Clinical Centre Tuzla, 75000 Tuzla, Bosnia and Herzegovina
4Present address: Department of Neurology, Primary Health Care Centre Tuzla, Albina i Franje Herljevića 1, 75000 Tuzla, Bosnia and Herzegovina