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Ultrasonography, Prenatal
Cordocentesis
Doppler Pulsed Ultrasonography
Abortion, Eugenic
Pregnancy
Gestational Age
Crown-Rump Length
First Pregnancy Trimester
Prospective Studies
Sensitivity and Specificity
Regression Analysis
Predictive Value of Tests
Risk Factors
Premature Obstetric Labor
Digestive System Abnormalities
Placenta Previa
Anencephaly
Limb Deformities, Congenital
Middle Cerebral Artery
Suppositories
Co-Publications
7
6
2
1
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