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, AnimalPlacentaPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdCivil DisordersPostoperative ComplicationsPlacenta DiseasesPregnancy Complications, InfectiousEclampsiaPregnancy, TwinObstetric Labor, PrematureInfant, NewbornPlacental CirculationGestational AgeTrophoblastsCongenital AbnormalitiesDiabetes, GestationalFetal DeathPreconception CarePregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsPrenatal CareStillbirthInfant, Small for Gestational AgeUterusAbortion, HabitualUltrasonography, PrenatalPregnancy ProteinsRisk FactorsBirth WeightPregnancy RateMaternal AgeParityRetrospective StudiesAntibodies, AntiphospholipidPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangeProspective StudiesPregnancy in DiabeticsPregnancy, TubalAntiphospholipid SyndromeMaternal WelfareReproductive Techniques, AssistedFetal DevelopmentInfant, Low Birth WeightFetal Membranes, Premature RuptureFertilization in VitroCohort StudiesPregnancy in AdolescenceDeciduaOdds RatioQuestionnairesThrombophiliaLogistic ModelsTreatment OutcomeNorwayRisk AssessmentPregnancy, UnplannedPregnancy, UnwantedIntraoperative ComplicationsHomocysteinePhysiciansMedical Staff, HospitalIncidenceUnited StatesPregnancy Complications, ParasiticInfant, PrematureTime FactorsPregnancy, ProlongedAbortion, InducedCase-Control StudiesPrevalenceConfidence IntervalsPhysician-Patient RelationsFollow-Up StudiesPregnancy, AbdominalPregnancy Maintenance