1. Department of Clinical Neurosciences, Cumming School of Medicine University of Calgary and Foothills Medical Centre Calgary AB Canada
2. Department of Radiology, Cumming School of Medicine University of Calgary and Foothills Medical Centre Calgary AB Canada
3. Department of Community Health Sciences, Cumming School of Medicine University of Calgary and Foothills Medical Centre Calgary AB Canada
4. Centre Hospitalier de l'Université de Montréal Montreal Quebec Canada
5. Department of Interventional Radiology Warren Alpert Medical School of Brown University Providence RI
6. Department of Neurology Emory University School of Medicine Atlanta GA
7. Department of Medicine University of Alberta Hospital Edmonton Canada