title: Polio and ALS.
authors.forename: F H
authors.initials: FH
authors.lastname: Norris
authors.forename: E H
authors.initials: EH
authors.lastname: Denys
authors.forename: K
authors.initials: K
authors.lastname: Sangu
mesh_terms: D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology / Q000235:genetics; D002140:California; D006801:Humans; D008875:Middle Aged; D011051:Poliomyelitis / Q000453:epidemiology