1. Department of Neurosurgery, Faculty of Medicine, Izmir Katip Çelebi University, Izmir, Turkey
2. Department of Neurosurgery, Ataturk Research and Training Hospital, Izmir, Turkey
3. Department of Neurology, Faculty of Medicine, Balikesir University, Balıkesir, Turkey
4. Department of Neurology, Ataturk Research and Training Hospital, Izmir, Turkey
5. Department of Neurology, Ekol Hospitals, Izmir, Turkey