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C. Scott Collins

and Christopher M. Wittich

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date: 19 October 2019

Chromosome abnormalities occur in 1 in 180 live births. One-third of these abnormalities are due to autosomal aneuploidy—an abnormal number of chromosomes. Risk factors for autosomal aneuploidy are maternal age 35 years or older and having had an affected child. The most common autosomal aneuploidy syndrome in term infants is Down syndrome.

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