Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstPregnancy, EctopicAbortion, SpontaneousPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePremature BirthSeverity of Illness IndexPregnancy, AnimalPlacentaPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdPostoperative ComplicationsCivil DisordersPlacenta DiseasesPregnancy Complications, InfectiousEclampsiaObstetric Labor, PrematurePregnancy, TwinInfant, NewbornGestational AgePlacental CirculationTrophoblastsCongenital AbnormalitiesDiabetes, GestationalFetal DeathPreconception CarePregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsStillbirthRisk FactorsPrenatal CareInfant, Small for Gestational AgeUterusAbortion, HabitualUltrasonography, PrenatalPregnancy ProteinsBirth WeightRetrospective StudiesPregnancy RateMaternal AgeParityAntibodies, AntiphospholipidProspective StudiesPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangePregnancy in DiabeticsPregnancy, TubalAntiphospholipid SyndromeCohort StudiesMaternal WelfareReproductive Techniques, AssistedFetal DevelopmentInfant, Low Birth WeightFetal Membranes, Premature RuptureFertilization in VitroTreatment OutcomePregnancy in AdolescenceOdds RatioDeciduaLogistic ModelsThrombophiliaRisk AssessmentPregnancy, UnplannedPregnancy, UnwantedIncidenceIntraoperative ComplicationsTime FactorsHomocysteineCase-Control StudiesQuestionnairesNorwayInfant, PrematurePregnancy Complications, ParasiticUnited StatesFollow-Up StudiesPrevalencePregnancy, ProlongedBiological MarkersAbortion, InducedConfidence IntervalsPregnancy, AbdominalPregnancy MaintenanceEmbryo Implantation