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Pregnancy
Gestational Age
Uterine Contraction
Pregnancy, Multiple
Birth Weight
Premature Obstetric Labor
Premature Birth
Pregnancy Complications
Pre-Eclampsia
Premature Rupture Fetal Membranes
Newborn Infant
Twins
Triplets
Prospective Studies
Pregnancy Outcomes
Cohort Studies
Risk Factors
Parity
Ultrasonography, Prenatal
South Carolina
Co-Publications
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12
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8
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