title: Letter: Autism and mental subnormality in Northern Ireland.
mesh_terms: D001321:Autistic Disorder / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000453:epidemiology*; D008297:Male; D009660:Northern Ireland; D012737:Sex Factors; D012959:Socioeconomic Factors