1. Department of Neurology, Sean M. Healey & AMG Center for ALS at Mass General, Massachusetts General Hospital, Boston, MA, USA
2. Department of Biostatistics, Harvard Medical School, Massachusetts General Hospital, Boston, MA, USA
3. Mayo Clinic, Rochester, MN, USA
4. Hospital for Special Care, New Britain, CT/University of Connecticut School of Medicine, Farmington, CT, USA
5. Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH, USA
6. Tel Aviv Sourasky Medical Center, Tel Aviv-Yafo, Israel
7. Department of Neurology, Emory University Hospital, Atlanta, GA, USA
8. Neuromuscular Center, Department of Neurology, Neurological Institute, Cleveland Clinic, Cleveland, OH, USA
9. Neurology, University of Michigan, Ann Arbor, MI, USA
10. Henry Ford Health System, Detroit, MI, USA
11. Montreal Neurological Institute & Hospital, Montreal, Canada
12. Department of Neurology, University of Pennsylvania Medical Center, Philadelphia, PA, USA
13. Department of Neurology, The Agnes Ginges Center for Human Neurogenetics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
14. Providence ALS Center, Portland, OR, USA
15. Department of Neurology, Augusta University, Augusta, GA, USA
16. University of Maryland Medical Center, College Park, MD, USA
17. Cedars-Sinai Medical Center, Los Angeles, CA, USA
18. Department of Neurology, University of Minnesota Medical Center, Minneapolis, MN, USA
19. Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, USA
20. Vidant Medical Center, Greenville, NC, USA
21. Department of Neuroscience, University of Cincinnati Medical Center, Cincinnati, OH, USA
22. Ochsner Health System, New Orleans, LA, USA