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Down's Syndrome
Tricuspid Valve Insufficiency
Trisomy
Nuchal Translucency Measurement
Chromosomes, Human, Pair 18
Nasal Bones
Chromosomes, Human, Pair 13
Ultrasonography, Prenatal
Doppler Pulsed Echocardiography
Prenatal Diagnosis
Pregnancy
Crown-Rump Length
Gestational Age
Pregnancy-Associated Plasma Protein-A
beta Subunit Human Chorionic Gonadotropin
First Pregnancy Trimester
Likelihood Functions
Reference Values
Risk Assessment
Retrospective Studies
Co-Publications
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