1. Department of Neurosurgery in King Abdulaziz Medical City, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center Ministry of National Guard Health Affairs, Riyadh, Saudi Arabia
2. Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Center (KFSH&RC), Riyadh, Saudi Arabia
3. Pathology and Clinical Laboratory Medicine Administration, King Fahd Medical City, Riyadh, Saudi Arabia
4. Neurosurgery Department, National Neuroscience Institute, King Fahd Medical City, Riyadh, Saudi Arabia