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Down's Syndrome
Fetal Diseases
Ultrasonography, Prenatal
Karyotyping
Amniocentesis
Second Pregnancy Trimester
Maternal Age
Sensitivity and Specificity
ROC Curve
Likelihood Functions
Predictive Value of Tests
Prospective Studies
Risk Factors
Gestational Age
Pregnancy
False Positive Reactions
Frontal Lobe
Nasal Bones
Papillary Muscles
Fetal Heart
Co-Publications
4
3
2
1
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