1. Department of Neurosurgery, Istanbul Training and Research Hospital, Istanbul, Turkey
2. Department of Neurology, Haydarpaşa Training and Research Hospital, Istanbul, Turkey
3. Department of Neurosurgery, Yeditepe University School of Medicine, Istanbul, Turkey
4. Department of Radiology, Istanbul Training and Research Hospital, Istanbul, Turkey
5. Department of Neurosurgery, Ereğli State Hospital, Zonguldak, Turkey
6. Department of Neurosurgery, Dr. Lütfi Kırdar Kartal Training and Research Hospital, Istanbul, Turkey
7. Department of Radiology, Yeditepe University School of Medicine, Istanbul, Turkey
8. Department of Neurology, Yeditepe University School of Medicine, Istanbul, Turkey