Potential biases in Down syndrome birth prevalence estimation.
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D000328:Adult; D015982:Bias; D003718:Denmark / Q000453:epidemiology; D004314:Down Syndrome / Q000175:diagnosis / Q000453:epidemiology*; D004739:England / Q000453:epidemiology; D005260:Female; D006801:Humans; D008423:Maternal Age; D015201:Meta-Analysis as Topic; D008875:Middle Aged; D011247:Pregnancy; D011296:Prenatal Diagnosis; D015995:Prevalence; D015996:Survival Rate