| http://www.w3.org/ns/prov#value | - MethodsThis is a retrospective cohort study of all consecutive pregnancies undergoing prenatal screening for DS and genetic invasive procedures (amniocentesis or chorionic villus sampling???CVS) between January 1999 and December 2011 at Dexeus Institut, a private center with a fetal medicine national referral unit.According to Spanish health policies, second trimester screening for DS was carried
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