1. Department of Environmental Health, Harvard University T H Chan School of Public Health, Boston, MA, USA
2. KSM Research and Innovation Institute, Maccabi Healthcare Services, Israel
3. Sean M. Healey and AMG Center for ALS, Department of Neurology, Massachusetts General Hospital, Boston, MA, USA
4. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Boston, MA, USA, and
5. Department of Epidemiology, Harvard University T H Chan School of Public Health, Boston, MA, USA