title: Familial aggregation in amyotrophic lateral sclerosis.
authors.forename: Susan
authors.initials: S
authors.lastname: Byrne
authors.forename: Orla
authors.initials: O
authors.lastname: Hardiman
mesh_terms: D000690:Amyotrophic Lateral Sclerosis / Q000453:epidemiology / Q000235:genetics*; D005192:Family Health; D006801:Humans; D035781:Siblings; D013548:Sweden / Q000453:epidemiology