1. Marmara University, School of Medicine, Department of Neurosurgery, İstanbul, Turkey

2. Department of Histology and Embryology, Ankara University School of Medicine, Ankara, Turkey

3. Kafkas University School of Medicine, Department of Histology and Embryology, Kars, Turkey

4. Yenimahalle Training and Research Hospital, Department of Neurosurgery, Ankara, Turkey

5. Gazi University, School of Medicine, Department of Neurosurgery, Ankara, Turkey