Despite of many extensive studies held on an inielieciual disability, it still reimains one of the most mysterious neuropsychiatric disorders. The prevalence of an intellectual disability (2-3% of the population) and its variability induce active research of the etiology of this disorder. Frequently, such research directs to genetic causes of an intellectual disability. The epidemiology of an intellectual disability is quite astonishing - there are more males, affected by inteliectual disability, than there are females.
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