1. Medical Faculty, Department of Neurosurgery, Karadeniz Technical University, Trabzon, Turkey
2. Medical Faculty, Department of Anesthesiology and Critical Care. Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
3. Medical Faculty, Department of Neurosurgery, Recep Tayyip Erdogan University, Rize Merkez, Turkey
4. Department of Ophthalmology, Recep Tayyip Erdogan University Medical Faculty, Rize Merkez, Turkey