Chromosome abnormalities and maternal age.
D000328:Adult; D002869:Chromosome Aberrations / Q000453:epidemiology*; D025063:Chromosome Disorders; D004314:Down Syndrome / Q000453:epidemiology; D005260:Female; D006801:Humans; D007621:Karyotyping; D008423:Maternal Age; D008875:Middle Aged; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012306:Risk