1. Neurosurgery Department, Yuzuncu Yil University Faculty of Medicine, Van, Turkey
2. Department of Neurosurgery, Van District Training and Research Hospital, 65100 Van, Turkey
3. Department of Radiology, Van District Training and Research Hospital, 65100 Van, Turkey
4. Department of Anesthesiology and Reanimation, Van District Training and Research Hospital, 65100 Van, Turkey