1. Calgary Stroke Program, Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
2. Duke Clinical Research Center, Durham, North Carolina
3. Department of Neurology, Duke University School of Medicine, Durham, North Carolina
4. Department of Neurology, University of California Los Angeles, Los Angeles
5. David Geffen School of Medicine, Division of Cardiology, University of California, Los Angeles, Los Angeles
6. Department of Neurology, Massachusetts General Hospital, Boston
7. Department of Neurology, University of Pennsylvania, Philadelphia
8. University of Texas Southwestern Medical Center, Dallas