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Pregnancy
Gestational Age
Down's Syndrome
Trisomy
alpha-Fetoproteins
Pregnancy-Associated Plasma Protein-A
beta Subunit Human Chorionic Gonadotropin
Chorionic Gonadotropin
Inhibins
First Pregnancy Trimester
Second Pregnancy Trimester
Biological Markers
Risk Factors
Predictive Value of Tests
Maternal Age
Prenatal Diagnosis
Chromosomes, Human, Pair 18
Amniotic Fluid
False Positive Reactions
Scotland
Co-Publications
40
21
9
8
7
6
4
3
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