1. Department of Neurosurgery, Medical Faculty of Ataturk University, Erzurum, Turkey
2. Department of Neurosurgery Recep, Tayyip Erdogan University, Medical Faculty, Rize, Turkey
3. Department of Histology and Embryology, Medical Faculty, Atatürk University, Erzurum, Turkey
4. Department of Pathology, Medical Faculty of Ataturk University, Erzurum, Turkey