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, ThirdPostoperative ComplicationsCivil DisordersPlacenta DiseasesPregnancy Complications, InfectiousPregnancy, TwinEclampsiaObstetric Labor, PrematureInfant, NewbornGestational AgePlacental CirculationCongenital AbnormalitiesTrophoblastsDiabetes, GestationalFetal DeathPreconception CarePregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsPrenatal CareStillbirthAbortion, HabitualUterusInfant, Small for Gestational AgeRisk FactorsUltrasonography, PrenatalPregnancy ProteinsBirth WeightPregnancy RateMaternal AgeParityRetrospective StudiesAntibodies, AntiphospholipidPregnancy TrimestersPlacental InsufficiencyPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangeProspective StudiesPregnancy in DiabeticsPregnancy, TubalReproductive Techniques, AssistedAntiphospholipid SyndromeMaternal WelfareFertilization in VitroFetal DevelopmentInfant, Low Birth WeightFetal Membranes, Premature RuptureCohort StudiesPregnancy in AdolescenceOdds RatioTreatment OutcomeDeciduaRisk AssessmentThrombophiliaLogistic ModelsPregnancy, UnplannedPregnancy, UnwantedTime FactorsIntraoperative ComplicationsNorwayHomocysteineUnited StatesIncidenceQuestionnairesInfant, PrematurePregnancy Complications, ParasiticPregnancy, ProlongedCase-Control StudiesAbortion, InducedPrevalenceConfidence IntervalsFollow-Up StudiesPregnancy, AbdominalEmbryo ImplantationEmbryo TransferPregnancy MaintenanceBiological Markers