1. Department of Neurology, Wayne State University School of Medicine, Detroit, Michigan, USA.
2. Division of Neurology, Department of Medicine, King Abdulaziz Medical City, MNGHA, Riyadh, Saudi Arabia.
3. College of Medicine, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.
4. King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia.
5. Army Medical College, Military Hospital, Rawalpindi, Pakistan.
6. Aga Khan University, Karachi, Pakistan.