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Pregnancy
Gestational Age
Prenatal Diagnosis
Ultrasonography, Prenatal
Amniocentesis
Mass Screening
Down's Syndrome
Fetal Diseases
Cystic Fibrosis
Hypophosphatasia
Amniotic Fluid
Retrospective Studies
Biological Markers
Second Pregnancy Trimester
Prospective Studies
Predictive Value of Tests
alpha-Fetoproteins
Alkaline Phosphatase
Chorionic Gonadotropin
Newborn Infant
Co-Publications
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