title: Gulf War service is an uncertain trigger for ALS.
mesh_terms: D000328:Adult; D017677:Age Distribution; D017668:Age of Onset; D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology*; D015331:Cohort Studies; D004781:Environmental Exposure; D006801:Humans; D015994:Incidence; D008875:Middle Aged; D018923:Persian Gulf Syndrome / Q000453:epidemiology*; D012189:Retrospective Studies; D014728:Veterans; D014857:Warfare