1. 1Clinic of Neurosurgery, Clinical Centre Niš, University of Niš, Vojvode Stepe 22b, 18000, Nis, Serbia
2. 2Institute of Radiology, Clinical Centre Niš, University of Niš, Vojvode Stepe 22b, 18000, Nis, Serbia
3. 3Institute of Pathology, Clinical Centre Niš, University of Niš, Vojvode Stepe 22b, 18000, Nis, Serbia