1 Neuroscience Center, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia; Department of Medicine, Armed Forces Hospitals, Khamis Mushait, Southern Region, Saudi Arabia.
2 Neuroscience Center, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
3 Neuroscience Center, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia; Alfaisal University, Riyadh, Saudi Arabia.