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First Pregnancy Trimester
Biological Markers
Predictive Value of Tests
Prospective Studies
Maternal Age
Pregnancy
Gestational Age
Pregnancy-Associated Plasma Protein-A
beta Subunit Human Chorionic Gonadotropin
ADAM Proteins
Down's Syndrome
Pre-Eclampsia
Prenatal Diagnosis
Case Control Studies
Ultrasonography, Prenatal
Mass Screening
Nuchal Translucency Measurement
Neck
False Positive Reactions
Denmark
Co-Publications
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8
3
2
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