1. Department of Neurology Massachusetts General Hospital, Harvard Medical School Boston Massachusetts USA
2. Department of Neurology Stanford University Hospital Palo Alto California USA
3. Department of Neurology Yale University School of Medicine New Haven Connecticut USA
4. Department of Neurology Duke University Durham North Carolina USA
5. Department of Neurological Sciences Larner College of Medicine at the University of Vermont Burlington Vermont USA
6. Department of Neurology Medical University of South Carolina Charleston South Carolina USA
7. Department of Biostatistics University of Alabama Birmingham Alabama USA
8. Division of Clinical Research National Institute of Neurological Disorders and Stroke, National Institutes of Health, NINDS Rockville Maryland USA
9. Department of Neurology George Washington University Medical Center Washington District of Columbia USA
10. Department of Neurology The University of North Carolina Chapel Hill North Carolina USA