Mental retardation: a demographic view.
D002648:Child; D002674:Child, Institutionalized; D002675:Child, Preschool; D003710:Demography; D004495:Education of Persons with Intellectual Disabilities; D005190:Family; D006801:Humans; D008607:Intellectual Disability / Q000453:epidemiology*; D007361:Intelligence Tests; D012917:Social Adjustment; D012928:Social Desirability; D012940:Social Problems