1. Department of Otorhinolaryngology, Recep Tayyip Erdoğan University Faculty of Medicine, Rize, Turkey;
2. Department of Neurosurgery Rize, Recep Tayyip Erdoğan University Faculty of Medicine, Rize, Turkey;
3. Department of Neurosurgery, Ataturk University Faculty of Medicine, Erzurum, Turkey;
4. Department of Otorhinolaryngology, University of Health Sciences -Samsun Health Practices and Research Center, Samsun, Turkey;
5. Neurology and Neurosurgery, Psychiatry Clinic Istanbul, Bakırkoy Education and Research Hospital for Psychiatry, Istanbul, Turkey;
6. Erzurum Training and Research Hospital Neurosurgery Clinic, Erzurum, Turkey;
7. Department of Pathology, Ataturk University Faculty of Medicine, Erzurum, Turkey;
8. Department of Neurosurgery, Okmeydanı Training and Research Hospital, Istanbul, Turkey