1. Department of Neurology; Massachusetts General Hospital; Boston Massachusetts
2. Department of Neurology; Brigham and Women's Hospital; Boston Massachusetts
3. Harvard Medical School; Boston Massachusetts
4. Division of Research; Kaiser Permanente of Northern California; Oakland California
5. Department of Medicine; Epidemiology and Biostatistics; University of California; San Francisco California
6. Departments of Health Research and Policy; Stanford University School of Medicine; Stanford California
7. Division of General Internal Medicine; Massachusetts General Hospital; Boston Massachusetts
8. Division of Hospital Medicine; University of California; San Francisco California
9. Department of Research and Evaluation; Kaiser Permanente of Southern California; Pasadena California