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Down's Syndrome
Tricuspid Valve Insufficiency
Turner's Syndrome
Trisomy
Diseases in Twins
Chromosome Disorders
Fetal Diseases
Nuchal Translucency Measurement
Chromosomes, Human, Pair 12
Chromosomes, Human, Pair 18
Head
Thoraces
Pregnancy
Crown-Rump Length
First Pregnancy Trimester
Pregnancy-Associated Plasma Protein-A
beta Subunit Human Chorionic Gonadotropin
Chorionic Villus Sampling
Ultrasonography, Prenatal
Monozygotic Twins
Co-Publications
3
2
1
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