1. Departmant of Neurosurgery, Sakarya University Training and Research Hospital, Sakarya, 54010, Turkey
2. Department of Orthopedics, Yenimahalle State Hospital, Ankara, Turkey
3. Department of Neurosurgery, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
4. Department of Mechanical Engineering, Yenimahalle State Hospital, Ankara, Turkey