Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstPregnancy, EctopicAbortion, SpontaneousPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePostoperative ComplicationsPremature BirthPregnancy, AnimalPlacentaPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdCivil DisordersPlacenta DiseasesPregnancy Complications, InfectiousEclampsiaPregnancy, TwinObstetric Labor, PrematureInfant, NewbornRetrospective StudiesGestational AgePlacental CirculationTrophoblastsDiabetes, GestationalCongenital AbnormalitiesFetal DeathPreconception CarePregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsTreatment OutcomeStillbirthPrenatal CareRisk FactorsInfant, Small for Gestational AgeUterusAbortion, HabitualUltrasonography, PrenatalPregnancy ProteinsBirth WeightPregnancy RateMaternal AgeParityAntibodies, AntiphospholipidProspective StudiesPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangePregnancy in DiabeticsPregnancy, TubalAntiphospholipid SyndromeFollow-Up StudiesMaternal WelfareReproductive Techniques, AssistedFetal DevelopmentInfant, Low Birth WeightCohort StudiesFetal Membranes, Premature RuptureFertilization in VitroPregnancy in AdolescenceDeciduaOdds RatioRisk AssessmentTime FactorsThrombophiliaLogistic ModelsIntraoperative ComplicationsPregnancy, UnplannedPregnancy, UnwantedIncidenceHomocysteineNorwayReoperationPregnancy Complications, ParasiticInfant, PrematureTomography, X-Ray ComputedUnited StatesQuestionnairesPregnancy, ProlongedCase-Control StudiesAbortion, InducedLaparoscopyConfidence IntervalsPrevalencePregnancy, AbdominalNeurosurgical Procedures