1. From the Department of Community Health Sciences (J.K.H., T.S.W., M.D.H.), Alberta Children’s Hospital Research Institute and O’Brien Institute for Public Health (T.S.W.), Departments of Clinical Neurosciences (N.K., M.D.H., M.G.) and Radiology (M.D.H., M.G.), and Calgary Stroke Program, Hotchkiss Brain Institute (M.D.H., M.G.), University of Calgary, Alberta, Canada; and Division of Engineering Science, University of Toronto, Ontario, Canada (D.M.).