1. Alfaisal University, Riyadh 11533, Saudi Arabia
2. Division of Neurological Surgery, Neurosciences Department, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia
3. Division of Ophthalmology, Department of Surgery, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia
4. Division of Neurological Surgery, Faculty of Medicine, King Abdulaziz University, Jeddah 21589, Saudi Arabia