| http://www.w3.org/ns/prov#value | - Truncation symbols were used to include all possible variations of the search term (i.e., screen, screening, screened).Studies were eligible for inclusion if they provided the data necessary to calculate the number of true positives, false positives, false negatives and true negatives for a chromosomal anomaly other than trisomy 21 using a currently available prenatal screening test (see Table 1).
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