1. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
2. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Massachusetts General Hospital, Brigham and Women's Hospital, and Harvard Medical School, Boston
3. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
4. Sean M. Healey & AMG Center for ALS at Massachusetts General Hospital, Boston