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Pregnancy
Gestational Age
Ultrasonography, Prenatal
Ultrasonography, Doppler
Umbilical Veins
Fetuses
Livers
Fetal Heart
Umbilical Arteries
Portal Vein
Blood Flow Velocity
Cross-Sectional Studies
Second Pregnancy Trimester
Reference Values
Prospective Studies
Longitudinal Studies
Newborn Infant
Fetal Development
Pulsatile Flow
Fetal Growth Retardation
Co-Publications
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12
11
8
6
5
4
3
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