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Pregnancy
Gestational Age
Ultrasonography, Prenatal
Karyotyping
Nuchal Translucency Measurement
Neck
Fetal Heart
Fetuses
Down's Syndrome
Fetal Diseases
Congenital Heart Defects
Chromosome Aberrations
Chromosome Disorders
Pregnancy Outcomes
Blood Flow Velocity
First Pregnancy Trimester
Prospective Studies
Sensitivity and Specificity
Risk Factors
Netherlands
Co-Publications
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