1. Department of Neurosurgery, Maltepe University, Faculty of Medicine, Istanbul, Turkey
2. Department of Neurosurgery, Istanbul Research and Training Hospital, Istanbul, Turkey
3. Department of Orthopaedic Surgery, Maltepe University, Faculty of Medicine, Istanbul, Turkey
4. Department of Medical Biology, Cerrahpasa Faculty of Medicine, Istanbul, Turkey
5. Department of Medical Biochemistry, Cerrahpasa Faculty of Medicine, Istanbul, Turkey
6. Department of Anesthesia, Kartal Kosuyolu Research and Training Hospital, Istanbul, Turkey