| http://www.w3.org/ns/prov#value | - Both first- and second-trimester screening programs have been expanded to include risk assignment for trisomy 18.8???10 Targeted screening algorithms have not been developed for chromosomal abnormalities other than Down syndrome and trisomy 18, although it has been suggested that a trisomy 13 risk might be calculated.11 The construction of such algorithms would require recognition of a characteris
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