Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaPregnancy Complications, CardiovascularHypertension, Pregnancy-InducedPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsStillbirthPregnancy Complications, NeoplasticPregnancy Trimester, FirstFetal Growth RetardationEclampsiaObstetric Labor ComplicationsPregnancy, EctopicAbortion, SpontaneousAbruptio PlacentaeFetal DeathPregnancy Trimester, ThirdGestational AgeInfant, NewbornPregnancy Complications, InfectiousPremature BirthDiabetes, GestationalCesarean SectionPregnancy, AnimalObstetric Labor, PrematurePlacentaCardiotocographyPrenatal CareCongenital AbnormalitiesPregnancy, High-RiskPregnancy Trimester, SecondUterine ArteryCivil DisordersPostoperative ComplicationsPlacenta DiseasesUltrasonography, PrenatalPregnancy, TwinMaternal AgePlacental CirculationTrophoblastsInfant, Small for Gestational AgeBirth WeightParityPreconception CareDelivery, ObstetricRisk FactorsFetal MonitoringPregnancy, MultipleFetal DistressFetal Membranes, Premature RuptureRetrospective StudiesUterusAbortion, HabitualPregnancy ProteinsPregnancy RateInfant, Low Birth WeightUterine HemorrhageProspective StudiesAntibodies, AntiphospholipidPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsCohort StudiesMaternal-Fetal ExchangePuerperal DisordersPregnancy in DiabeticsPostpartum PeriodPeripartum PeriodPregnancy, TubalAntiphospholipid SyndromeInsuranceMaternal WelfareReproductive Techniques, AssistedFetal DevelopmentPlacenta PreviaLabor, ObstetricFetal MovementFertilization in VitroLogistic ModelsPregnancy in AdolescenceDeciduaInfant, PrematureOdds RatioThrombophiliaHeart Rate, FetalTreatment OutcomePregnancy, UnplannedRisk AssessmentFetal DiseasesPregnancy, UnwantedPerinatal MortalityIntraoperative ComplicationsApgar ScoreCase-Control StudiesUnited StatesHomocysteine