1. Division of Cardiology, University of California, Los Angeles, CA
2. Duke Clinical Research Center, Durham, NC
3. Department of Clinical Neurosciences, Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
4. Department of Epidemiology, Michigan State University, East Lansing, MI
5. Division of Neurology, University of California, Los Angeles, CA
6. Division of Neurology, Massachusetts General Hospital, Boston, MA