1. Department of Neurosurgery, Erciyes University, Medical School, Kayseri, Turkey.
2. Neurosurgery Clinic, Ministry of Health, Sevket Yilmaz Research and Training Hospital, Bursa, Turkey.
3. Neurosurgery Clinic, Ministry of Health, Söke State Hospital, Aydın, Turkey.
4. Department of Neurosurgery, Mustafa Kemal University, Hatay, Turkey.