StillbirthPregnancy ComplicationsPregnancyPregnancy OutcomeFetal DeathPre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicAbortion, SpontaneousFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstPremature BirthFetal Growth RetardationAbruptio PlacentaePregnancy, EctopicPregnancy Complications, NeoplasticInfant, NewbornPlacentaGestational AgeCongenital AbnormalitiesPregnancy Complications, InfectiousPregnancy, AnimalPregnancy Trimester, ThirdPlacenta DiseasesPregnancy Trimester, SecondEclampsiaObstetric Labor ComplicationsUterine ArteryObstetric Labor, PrematurePregnancy, High-RiskCivil DisordersPostoperative ComplicationsMaternal AgeCesarean SectionPrenatal CarePregnancy, MultiplePregnancy, TwinDiabetes, GestationalBirth WeightParityPlacental CirculationTrophoblastsInfant, Small for Gestational AgeRisk FactorsPreconception CareDelivery, ObstetricUltrasonography, PrenatalUterusPregnancy TestsPlacental InsufficiencyAbortion, HabitualRetrospective StudiesInfant MortalityPregnancy ProteinsPregnancy TrimestersPregnancy in DiabeticsInfant, Low Birth WeightPregnancy RateProspective StudiesAntibodies, AntiphospholipidMaternal-Fetal ExchangePerinatal MortalityPlacentationMultiple Birth OffspringFetal Membranes, Premature RuptureCohort StudiesReproductive Techniques, AssistedMaternal WelfareOdds RatioFetal DevelopmentPregnancy, TubalPregnancy in AdolescenceAntiphospholipid SyndromeFertilization in VitroPregnancy Complications, ParasiticLogistic ModelsInfant, PrematurePregnancy, ProlongedDeciduaRisk AssessmentAbortion, VeterinaryThrombophiliaIncidenceNorwayAbortion, InducedTreatment OutcomePregnancy, UnplannedLive BirthCase-Control StudiesPregnancy, UnwantedIntraoperative ComplicationsHomocysteineConfidence IntervalsTime FactorsUnited StatesAbnormalities, Drug-InducedPerinatal CareFetal MonitoringPrevalence