1. Neurology Department-Faculty of Medicine, Cairo University, Cairo, Egypt
2. Department of Neurology and Neurogenetics, Hospital of Specialties, University Mohammed V – Souissi Rabat, Rabat, Morocco
3. Neurology Department, Hera Hospital, Makkah, KSA
4. Neurology Department, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt