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Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstPregnancy, EctopicAbortion, SpontaneousPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePremature BirthPregnancy, AnimalPlacentaRisk FactorsPregnancy Trimester, SecondPostoperative ComplicationsUterine ArteryPregnancy Trimester, ThirdInfant, NewbornCivil DisordersEclampsiaPlacenta DiseasesPregnancy Complications, InfectiousPregnancy, TwinObstetric Labor, PrematureGestational AgePlacental CirculationTrophoblastsDiabetes, GestationalCongenital AbnormalitiesHypertensionFetal DeathPreconception CareRetrospective StudiesPregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsStillbirthBirth WeightPrenatal CareUterusInfant, Small for Gestational AgeAbortion, HabitualUnited StatesUltrasonography, PrenatalPregnancy ProteinsProspective StudiesPregnancy RateMaternal AgeCohort StudiesParityAntibodies, AntiphospholipidPrevalencePlacental InsufficiencyPregnancy TrimestersPlacentationOdds RatioMultiple Birth OffspringPregnancy TestsLogistic ModelsDelivery, ObstetricMaternal-Fetal ExchangeRisk AssessmentTreatment OutcomePregnancy in DiabeticsInfant, Low Birth WeightPregnancy, TubalQuestionnairesAntiphospholipid SyndromeChronic DiseaseMaternal WelfareReproductive Techniques, AssistedFetal DevelopmentIncidenceFertilization in VitroFetal Membranes, Premature RuptureBlood PressurePregnancy in AdolescenceComorbidityTime FactorsDeciduaCase-Control StudiesFollow-Up StudiesThrombophiliaAge FactorsCross-Sectional StudiesConfidence IntervalsAutomobile Driver ExaminationPregnancy, UnplannedNorwayPregnancy, UnwantedHealth StatusIntraoperative ComplicationsDiabetes ComplicationsHomocysteine