1. College of Medicine and Medical Science, Arabian Gulf University, Manama, Bahrain
2. College of Medicine, Prince Sattam bin Abdulaziz University, Riyadh, Saudi Arabia
3. College of Medicine, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
4. College of Medicine, King Saud University, Riyadh, Saudi Arabia
5. King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
6. Division of Neurosurgery, Department of Surgery, King Abdulaziz Medical City, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia
7. Department of Pathology and Laboratory Medicine, King Abdulaziz Medical City, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia