PregnancyPregnancy OutcomePregnancy ComplicationsPregnancy RateEmbryo TransferPre-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 AgeTrophoblastsDiabetes, GestationalCongenital AbnormalitiesFetal DeathPreconception CarePregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsStillbirthPrenatal CareInfant, Small for Gestational AgeUterusAbortion, HabitualUltrasonography, PrenatalPregnancy ProteinsBirth WeightRisk FactorsMaternal AgeParityAntibodies, AntiphospholipidRetrospective StudiesPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangePregnancy in DiabeticsProspective StudiesPregnancy, TubalAntiphospholipid SyndromeMaternal WelfareReproductive Techniques, AssistedFetal DevelopmentInfant, Low Birth WeightFetal Membranes, Premature RuptureFertilization in VitroPregnancy in AdolescenceCohort StudiesDeciduaOdds RatioThrombophiliaLogistic ModelsTreatment OutcomePregnancy, UnplannedRisk AssessmentPregnancy, UnwantedIntraoperative ComplicationsHomocysteineNorwayIncidencePregnancy Complications, ParasiticInfant, PrematurePregnancy, ProlongedAbortion, InducedUnited StatesTime FactorsCase-Control StudiesQuestionnairesConfidence IntervalsPrevalencePregnancy, AbdominalFollow-Up StudiesPregnancy MaintenanceEmbryo ImplantationDiabetes Complications