TerbutalineObstetric Labor, PrematureTocolytic AgentsLabor, ObstetricLabor, InducedChorioamnionitisPregnancyFetal Membranes, Premature RuptureTocolysisPremature BirthAmniotic FluidLabor OnsetExtraembryonic MembranesInfant, PrematureGestational AgeTerm BirthUterine ContractionLabor PainAdrenergic beta-AgonistsRitodrineInfant, NewbornMyometriumAmniocentesisAmnionUterine MonitoringPregnancy OutcomePregnancy Trimester, ThirdPregnancy Complications, InfectiousCervical Length MeasurementCervix UteriDelivery, ObstetricNebulizers and VaporizersParturitionObstetric Labor ComplicationsInfant, Premature, DiseasesBronchodilator AgentsPregnancy ComplicationsTrial of LaborCervical RipeningLabor Stage, FirstPregnancy Trimester, SecondAdministration, InhalationBudesonideAbortion, ThreatenedCesarean SectionAdrenergic beta-2 Receptor AgonistsBetamethasoneChorionOxytocicsPlacentaVasotocinUreaplasma InfectionsFetal MonitoringAerosolsUterusDeciduaButoxamineReceptors, OxytocinUreaplasma urealyticumEthanolaminesUltrasonography, PrenatalLabor PresentationPregnancy, High-RiskPeak Expiratory Flow RatePregnenedionesAlbuterolMetaproterenolAsthmaPrenatal CareVaginosis, BacterialVaginaOligohydramniosLabor Stage, ThirdPlacental Function TestsFetusFenoterolInfant, Low Birth WeightParityFetal DeathReceptors, Adrenergic, beta-2Infant, Small for Gestational AgePre-EclampsiaForced Expiratory VolumeBirth WeightDouble-Blind MethodUterine Cervical IncompetenceButylaminesInfant, Newborn, DiseasesCerclage, CervicalRespiratory Distress Syndrome, NewbornPelvic InfectionGravidityPlacenta DiseasesPrenalterolMaximal Expiratory Flow RateMagnetocardiographyPregnancy, MultipleMagnesium SulfateCapillary Leak SyndromeCervix Mucus