ChinaLabor, ObstetricLabor, InducedLabor OnsetLabor PainObstetric Labor, PrematureObstetric Labor ComplicationsTrial of LaborPregnancyLabor PresentationLabor Stage, ThirdDelivery, ObstetricCesarean SectionOxytocicsMyometriumAnalgesia, EpiduralUterine ContractionTerm BirthTocolytic AgentsCervical RipeningAmnionParturitionFetal MonitoringExtraembryonic MembranesPregnancy, ProlongedChorioamnionitisFetal Membranes, Premature RuptureAmniotic FluidPregnancy OutcomeParityUterine MonitoringGestational AgeAnesthesia, ObstetricalCervix UteriInfant, NewbornPostpartum HemorrhageVaginal Birth after CesareanApgar ScorePhylogenyEmploymentDystociaTocolysisUterine RupturePregnancy Trimester, ThirdNatural ChildbirthPregnancy ComplicationsMidwiferyMeperidineChorionBupivacainePelvimetryObstetric NursingRural PopulationSequence Analysis, DNASufentanilAnesthesia, EpiduralPlacentaRisk FactorsHospitals, MaternityPregnancy Complications, InfectiousPremature BirthCervical Length MeasurementUterusReceptors, OxytocinFetal DistressTransients and MigrantsGeographyTime FactorsUterine InertiaEconomic DevelopmentObstetricsCross-Sectional StudiesPerineumEpisiotomyRitodrineFetal DeathPrevalencePrenatal CareCesarean Section, RepeatMolecular Sequence DataHeart Rate, FetalMisoprostolAmniocentesisUnemploymentObstetrics and Gynecology Department, HospitalDeciduaProspective StudiesCluster AnalysisAnesthetics, LocalTibetUltrasonography, PrenatalPostpartum PeriodAsian Continental Ancestry GroupSchistosomiasis japonicaGravidityGenotypeBetamethasoneVacuum Extraction, ObstetricalPerinatal CareQuestionnaires