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We studied the association between specific congenital syndromes and autism spectrum disorders (ASD) in the large Finnish Register material. Our data include all children diagnosed with ASD (n = 4441) according to Finnish Hospital Discharge Register in 1987–2000. Four controls per each case were matched to sex, birthplace, date of birth (±30 days) and residence in Finland (n = 17,695). The prevalence...
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