1. Department of Neurosurgery, Acıbadem University Faculty of Medicine, Istanbul, Turkey.
2. Department of Orthopedic Surgery-Spine Center, University of California at San Francisco, CA, USA.
3. Department of Neurosurgery, Acıbadem University Vocational School of Health Services, Istanbul, Turkey.
4. Department of Pathology, Acıbadem University Faculty of Medicine, Istanbul, Turkey.