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First Pregnancy Trimester
Risk Assessment
Maternal Age
Retrospective Studies
Pregnancy Outcomes
Predictive Value of Tests
Prospective Studies
Nuchal Translucency Measurement
Nasal Bones
Chromosomes, Human, Pair 13
Pregnancy
Pregnancy-Associated Plasma Protein-A
beta Subunit Human Chorionic Gonadotropin
Down's Syndrome
Trisomy
Chromosome Disorders
Ultrasonography, Prenatal
Pregnancy Reduction, Multifetal
Prenatal Diagnosis
Karyotyping
Co-Publications
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2
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