1. Department of Neurology Firoozgar Hospital, Iran University of Medical Sciences Tehran Iran
2. Department of Neurology Shahroud University of Medical Sciences Shahroud Iran
3. Department of Neurology Hazrat Rasool Hospital, Iran University of Medical Sciences Tehran Iran
4. Department of Neurology Shahid Beheshti Medical University Tehran Iran
5. Student Research Committee, School of Medicine Shahroud University of Medical Sciences Shahroud Iran