1. Department of Radiology and Clinical Neurosciences; Foothills Hospital, Cuming School of Medicine, University of Calgary; Calgary Alberta Canada
2. Department of Community Health Sciences and Medicine; Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary; Calgary Alberta Canada
3. Geffen School of Medicine at UCLA, UCLA Comprehensive Stroke Center; Los Angeles CA
4. Department of Neurology; Beth Israel Deaconess Medical Center, Harvard Medical School; Boston MA