1. Department of Neurosurgery, Medical Faculty of Ataturk University, Erzurum, Turkey
2. Department of Neurosurgery, Medical Faculty of Recep Tayyip Erdogan University, Rize, Turkey
3. Department of Histology, Medical Faculty of Ataturk University, Erzurum, Turkey
4. Department of Neurology, Medical Faculty of Recep Tayyip Erdogan University, Rize, Turkey
5. Department of Opthalmology, Medical Faculty of Recep Tayyip Erdogan University, Rize, Turkey
6. Kanuni Research and Training Hospital, Department of Neurosurgery, Trabzon, Turkey