1 Department of Clinical Neurological Sciences, University Hospital, London Health Science Center, the University of Western Ontario, ON N6A 5A5, Canada; Department of Neurology, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
2 Department of Clinical Neurological Sciences, University Hospital, London Health Science Center, the University of Western Ontario, ON N6A 5A5, Canada. Electronic address: Vladimir.hachinski@lhsc.on.ca.