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Pregnancy
Gestational Age
Pregnancy Outcomes
Prospective Studies
Second Pregnancy Trimester
Risk Factors
Logistic Models
First Pregnancy Trimester
Parity
Premature Infant
Premature Obstetric Labor
Premature Birth
Vaginosis, Bacterial
Pre-Eclampsia
Newborn Infant
Double-Blind Method
Ultrasonography, Prenatal
Cervix Uteri
Fibronectins
United States
Co-Publications
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