Mental retardation: past, present, and future.
D004495:Education of Persons with Intellectual Disabilities / Q000266:history; D006285:Health Planning; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008607:Intellectual Disability / Q000534:rehabilitation; D007361:Intelligence Tests; D014481:United States