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Pregnancy
Gestational Age
Pregnancy, Multiple
Prenatal Diagnosis
Ultrasonography, Prenatal
Amniocentesis
Karyotyping
Chorionic Villus Sampling
Pregnancy Reduction, Multifetal
Fetal Diseases
Chromosome Aberrations
Chromosome Disorders
Down's Syndrome
alpha-Fetoproteins
Second Pregnancy Trimester
Pregnancy Outcomes
Retrospective Studies
Risk Factors
Aneuploidy
Newborn Infant
Co-Publications
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21
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