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Premature BirthObstetric Labor, PrematureInfant, PrematurePregnancyInfant, NewbornBirth WeightGestational AgeInfant, Low Birth WeightPregnancy OutcomeFetal Membranes, Premature RuptureCerclage, CervicalInfant, Premature, DiseasesBirth RatePregnancy ComplicationsInfant, Small for Gestational AgeUterine Cervical IncompetenceChorioamnionitisCervical Length MeasurementInfant MortalityBirth CertificatesTerm BirthStillbirthRisk FactorsCervix UteriInfant, Extremely PrematureTocolytic AgentsPregnancy Trimester, SecondPregnancy, High-RiskPrenatal CareMaternal AgeCohort StudiesFetal DeathAmniotic FluidPregnancy Complications, InfectiousPregnancy, MultipleBirth OrderBirth IntervalsParityDelivery, ObstetricLogistic ModelsPerinatal CareProspective StudiesCesarean SectionRespiratory Distress Syndrome, NewbornMaternal ExposureInfant, Very Low Birth WeightMultiple Birth OffspringDevelopmental DisabilitiesHydroxyprogesteronesAdministration, IntravaginalVaginosis, BacterialCongenital AbnormalitiesCervical RipeningPregnancy Trimester, ThirdBronchopulmonary DysplasiaFetal Growth RetardationOdds RatioLabor, InducedIntensive Care Units, NeonatalChild DevelopmentSocioeconomic FactorsIntensive Care, NeonatalTwinsMothersPre-EclampsiaExtraembryonic MembranesTocolysisParturitionPregnancy, TwinInfant CareLabor, ObstetricPessariesProgestinsAbortion, SpontaneousPerinatal MortalityVital StatisticsCase-Control StudiesRetrospective StudiesFetal DevelopmentMaternal WelfareUltrasonography, PrenatalUreaplasma InfectionsBetamethasoneTripletsVaginaApgar ScorePregnancy Trimester, FirstPlacentaUnited StatesInfant, Newborn, DiseasesAfrican AmericansLabor OnsetTime FactorsAbruptio PlacentaeFetusGravidityInfant WelfarePreconception CareRetinopathy of PrematurityAmnion