1. Department of Neurology, University of Miami, Miami, FL, USA
2. Department of Neurology, Loma Linda University Health, Loma Linda, CA, USA
3. Department of Neurology, Medical College of Wisconsin, Milwaukee, WI, USA
4. UNC Health, UNC, Chapel Hill, NC, USA
5. Neurology Department, University of Tennessee Health Science Center, Memphis, TN, USA
6. Department of Neurology, University of Utah, Salt Lake City, UT, USA
7. ALS Department, Hospital Carlos III-La Paz, Madrid, Spain
8. Department of Rehabilitation, Elson S. Floyd College of Medicine, Washington State University, Spokane, WA, USA
9. Department of Neurology, St. Louis, MO, USA
10. Department of Neurology, University of Michigan, Ann Arbor, MI, USA
11. Department of Neurology, Temple Health, Philadelphia, PA, USA
12. University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
13. Medical School, Duke University, Durham, NC, USA
14. Department of Neurology, Duke University, Durham, NC, USA
15. Undergraduate, Duke University, Durham, NC, USA
16. Department of Neuroscience, University of Sheffield, Sheffield, South Yorkshire, UK
17. Department of Neurology, University of Nebraska Medical Center, Omaha, NE, USA
18. Department of Neuroscience, University of North Carolina, Chapel Hill, NC, USA
19. Hebrew University of Jerusalem, Jerusalem, Isreal
20. Undergraduate, Tulane University, New Orleans, LA, USA
21. Institute of Biology and Medical Genetics, Charles University, Prague, Czech Republic, and
22. Independent Consultant, Lichfield, England, UK