[1] Mashhad Univ Med Sci, Cardiovasc Res Ctr, Sch Med, Mashhad, Iran
[2] Univ Western Ontario, Dept Clin Neurol Sci, Univ Hosp, London Hlth Sci Ctr, London, ON, Canada
[3] Mashhad Univ Med Sci, Dept Neurol, Ghaem Hosp, Mashhad, Iran
[4] Mashhad Univ Med Sci, Clin Res Unit, Mashhad, Iran