Mental retardation. Introduction.
D000367:Age Factors; D002869:Chromosome Aberrations; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis / Q000209:etiology / Q000235:genetics; D008661:Metabolism, Inborn Errors / Q000150:complications* / Q000175:diagnosis; D011296:Prenatal Diagnosis