1. Neurology Research & Education Center, Covenant Medical Center, Lubbock, Texas, USA
2. National Institutes of Health, NINDS, Bethesda, Maryland, USA, and Rush‐Presbyterian, St. Luke's Medical Center, Chicago, Ilinois, USA
3. National Institutes of Health, NINDS, Bethesda, Maryland, USA
4. Department of Neurology, Emory University School of Medicine, Atlanta, Georgia, USA
5. Department of Neurology, University of Miami Medical Center, Miami, Florida, USA
6. Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas, USA
7. Clinical Neuroscience Center, Southfield, Michigan, and Department of Neurology, Psychiatry, and Behavioral Neuroscience, Wayne State University School of Medicine, Detroit, Michigan, USA
8. Vancouver Hospital & Health Sciences Center, University of British Columbia, Vancouver, British Columbia, Canada
9. University of Southern California, Los Angeles, California, USA
10. Department of Neurology, McGuire VA Hospital, Richmond, Virginia, USA
11. Department of Neurology, University Of Virginia Medical Center, Charlottesville, Virginia, USA
12. Discovery Therapeutics, Inc., Richmond, Virginia, USA