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Premature BirthRisk FactorsObstetric Labor, PrematurePregnancyInfant, PrematureInfant, NewbornBirth WeightGestational AgeInfant, Low Birth WeightPregnancy OutcomeFetal Membranes, Premature RuptureCerclage, CervicalInfant, Premature, DiseasesPregnancy ComplicationsBirth RateInfant, Small for Gestational AgeUterine Cervical IncompetenceCohort StudiesChorioamnionitisInfant MortalityCervical Length MeasurementTerm BirthBirth CertificatesStillbirthProspective StudiesLogistic ModelsCervix UteriMaternal AgeInfant, Extremely PrematurePrenatal CarePregnancy, High-RiskPregnancy Trimester, SecondTocolytic AgentsOdds RatioCase-Control StudiesPregnancy Complications, InfectiousFetal DeathAmniotic FluidRetrospective StudiesPregnancy, MultipleBirth OrderParityPrevalenceIncidenceDelivery, ObstetricRisk AssessmentBirth IntervalsPerinatal CareCesarean SectionSocioeconomic FactorsInfant, Very Low Birth WeightMaternal ExposureDevelopmental DisabilitiesRespiratory Distress Syndrome, NewbornUnited StatesAge FactorsMultiple Birth OffspringMultivariate AnalysisVaginosis, BacterialFollow-Up StudiesHydroxyprogesteronesAdministration, IntravaginalIntensive Care Units, NeonatalCongenital AbnormalitiesSmokingBronchopulmonary DysplasiaPregnancy Trimester, ThirdFetal Growth RetardationCross-Sectional StudiesCervical RipeningLabor, InducedChild DevelopmentTwinsMothersPre-EclampsiaIntensive Care, NeonatalRiskTime FactorsParturitionInfant CareAfrican AmericansRegression AnalysisEuropean Continental Ancestry GroupCardiovascular DiseasesSex FactorsAbortion, SpontaneousExtraembryonic MembranesTocolysisPregnancy, TwinProgestinsLabor, ObstetricPerinatal MortalityPessariesApgar ScoreVital StatisticsRegistriesFetal DevelopmentMaternal WelfareVaginaInfant, Newborn, Diseases