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Ultrasonography, Prenatal
Chorionic Villus Sampling
Karyotyping
Echocardiography, Four-Dimensional
Three-Dimensional Imaging
Pregnancy
Gestational Age
Cranial Sutures
Frontal Bone
Nuchal Translucency Measurement
Placenta
Second Pregnancy Trimester
Maternal Age
Predictive Value of Tests
Cross-Sectional Studies
Down's Syndrome
Chromosome Disorders
Holoprosencephaly
Acrocephalosyndactylia
Triplets
Co-Publications
11
9
5
4
3
2
1
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