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Pregnancy
Gestational Age
Ultrasonography, Prenatal
Ultrasonography
Prenatal Diagnosis
Karyotyping
Fetal Diseases
Down's Syndrome
Abnormalities, Multiple
Polyhydramnios
Congenital Heart Defects
Second Pregnancy Trimester
Prospective Studies
Risk Factors
Retrospective Studies
Pregnancy Outcomes
Maternal Age
Sensitivity and Specificity
Newborn Infant
alpha-Fetoproteins
Co-Publications
24
11
10
7
4
3
2
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