1. Department of Neurosurgery, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia,
2. Department of Adult Neurosurgery, National National Neuroscience Institute, King Fahad Medical City, Riyadh, Saudi Arabia,
3. Department of Neurosurgery, University of Miami, Miami, Florida, United States,
4. Department of Radiation Oncology, Comprehensive Cancer Center, King Fahad Medical City, Riyadh, Saudi Arabia.