1. Neurology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
2. Faculty of Medicine, October 6 University, Giza, Egypt
3. Neurology Department, Nasr City Insurance Hospital, Cairo, Egypt
4. Faculty of Medicine, Mutah University, Al-Karak, Jordan
5. Faculty of Medicine, Cairo University, Cairo, Egypt
6. Faculty of Medicine, Tanta University, Tanta, Egypt