Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstPregnancy, EctopicAbortion, SpontaneousPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePremature BirthPlacentaPregnancy, AnimalPregnancy Complications, InfectiousPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdCivil DisordersPostoperative ComplicationsPlacenta DiseasesInfant, NewbornEclampsiaObstetric Labor, PrematurePregnancy, TwinGestational AgePlacental CirculationTrophoblastsDiabetes, GestationalCongenital AbnormalitiesFetal DeathPreconception CarePregnancy, High-RiskCesarean SectionPregnancy, MultipleObstetric Labor ComplicationsSynaptic TransmissionPrenatal CareStillbirthRisk FactorsUterusInfant, Small for Gestational AgeAbortion, HabitualUltrasonography, PrenatalPregnancy ProteinsBirth WeightPregnancy RateMaternal AgeParityAntibodies, AntiphospholipidRetrospective StudiesPlacental InsufficiencyPregnancy TrimestersPlacentationMaternal-Fetal ExchangeMultiple Birth OffspringDelivery, ObstetricPregnancy TestsInfectious Disease Transmission, VerticalProspective StudiesDisease Transmission, InfectiousPregnancy in DiabeticsPregnancy, TubalAntiphospholipid SyndromeMaternal WelfareReproductive Techniques, AssistedInfant, Low Birth WeightFetal DevelopmentFertilization in VitroFetal Membranes, Premature RuptureCohort StudiesPregnancy in AdolescenceDeciduaOdds RatioThrombophiliaLogistic ModelsTreatment OutcomeRisk AssessmentPregnancy, UnplannedIncidenceTime FactorsPregnancy, UnwantedMicroscopy, Electron, TransmissionPregnancy Complications, ParasiticIntraoperative ComplicationsHomocysteinePrevalenceNorwayInfant, PrematureUnited StatesCase-Control StudiesPregnancy, ProlongedQuestionnairesAbortion, InducedConfidence IntervalsFollow-Up StudiesPregnancy, Abdominal