1. Department of Neurosurgery, Cankiri State Hospital, Cankiri, Turkey
2. Department of Neurosurgery, Faculty of Medicine, Hacettepe University, Sihhiye, Ankara, Turkey
3. Department of Physiology, Faculty of Medicine, Hacettepe University, Sihhiye, Ankara, Turkey
4. Department of Histology, Faculty of Medicine, Hacettepe University, Sihhiye, Ankara, Turkey
5. Department of Anatomy, Faculty of Medicine, Hacettepe University, Sihhiye, Ankara, Turkey