title: Agency-labeled mentally retarded persons in a metropolitan area: an ecological study.
mesh_terms: D001741:Black or African American; D002140:California; D006296:Health Services; D006801:Humans; D008607:Intellectual Disability / Q000145:classification* / Q000453:epidemiology; D008800:Mexico / Q000208:ethnology; D009938:Organizations; D012574:Schools; D012923:Social Class; D012931:Social Environment; D009626:Terminology as Topic; D014505:Urban Population