Fetal trisomy 21 risk:Likelihood:Pt:^Fetus:Qn
fetal trisomy 21 risk:likelihood:pt:^fetus:qn
Fetal trisomy 21 risk:Likelihood:To identify measures at a point in time:^Fetus:Quantitative
fetal trisomy 21 risk:likelihood:to identify measures at a point in time:^fetus:quantitative