1. Department of Neurosurgery, Ankara University, Ankara, Turkey
2. Department of Neurosurgery, Gaziantep University, Gaziantep, Turkey
3. Department of Neurosurgery, Kocaeli University, Kocaeli, Turkey
4. Department of Otolaryngology, Ankara University, Ankara, Turkey
5. Department of Neurosurgery, Health Ministery University, Cam and Sakura City Hospital, İstanbul, Turkey
6. Department of Neurosurgery, Cukurova University, Adana, Turkey
7. Department of Otolaryngology, Cukurova University, Adana, Turkey
8. Department of Neurosurgery, Liv Hospital, İstinye University, Ankara, Turkey
9. Department of Neurosurgery, Antalya University, Antalya, Turkey
10. Department of Neurosurgery, Hacettepe University, Ankara, Turkey
11. Department of Neurosurgery, Health Ministery University, Abdulhamit Han Hospital, İstanbul, Turkey
12. Department of Neurosurgery, Gazi University, Ankara, Turkey
13. Department of Neurosurgery, Health Ministery University, Yıldirim Beyazit Hospital, Ankara, Turkey
14. Department of Neurosurgery, Selçuk University, Konya, Turkey
15. Department of Neurosurgery, Health Ministery University, Tepecik Hospital, Izmir, Turkey
16. Department of Endocrinology and Metabolism, Ankara University, Ankara, Turkey
17. Department of Pathology, Ankara University, Ankara, Turkey
18. Department of Hematology and Oncology, Ankara University, Ankara, Turkey