1. Department of General Surgery, Medical Faculty, Ataturk University, Erzurum, Turkey
2. Department of Neurology, Medical Faculty, Ataturk University, Erzurum, Turkey
3. Department of Anesthesiology and Reanimation, Medical Faculty, Ataturk University, Erzurum, Turkey
4. Department of Pharmacology, Medical Faculty, Ataturk University, Erzurum, Turkey
5. Department of Pathology, Medical Faculty, Ataturk University, Erzurum, Turkey
6. Psychiatry Clinic, Bakirkoy Teaching and Research Hospital, Istanbul, Turkey
7. Department of Neurosurgery, Medical Faculty, Ataturk University, Erzurum, Turkey