1. Medical Faculty Department of Neurosurgery, Ataturk University, Erzurum, Turkey;
2. Department of Neurosurgery, Recep Tayyip Erdogan University Medical Faculty, Rize, Turkey;
3. Medical Faculty Department of Pharmacology, Ataturk University, Erzurum, Turkey;
4. Medical Faculty Department of Pathology, Ataturk University, Erzurum, Turkey;
5. Medical Faculty Department of Anesthesiology, Ataturk University, Erzurum, Turkey;
6. Medical Faculty Department of Neurology, Ataturk University, Erzurum, Turkey