1 Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
2 Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania.
3 Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada.
4 The Jay and Sari Sonshine Centre for Stroke Prevention & Cerebrovascular Brain Health, Toronto Western Hospital, University Health Network, Krembil Brain Institute, Toronto, Ontario, Canada.
5 Division of Neurology and Vancouver Stroke Program, University of British Columbia, Vancouver, British Columbia, Canada.
6 Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada.
7 Arrowhead Regional Medical Center, Colton, California.
8 Department of Radiology, Vancouver General Hospital, Vancouver, British Columbia, Canada.