Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstAbortion, SpontaneousPregnancy, EctopicPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePremature BirthCongenital AbnormalitiesPregnancy, AnimalPlacentaPregnancy Trimester, SecondPregnancy Trimester, ThirdUterine ArteryPostoperative ComplicationsInfant, NewbornCivil DisordersPlacenta DiseasesPregnancy Complications, InfectiousGestational AgePregnancy, TwinEclampsiaObstetric Labor, PrematureFetal DeathPlacental CirculationDiabetes, GestationalTrophoblastsPregnancy, High-RiskUltrasonography, PrenatalPreconception CarePregnancy, MultipleCesarean SectionObstetric Labor ComplicationsStillbirthUterusPrenatal CareAbortion, HabitualInfant, Small for Gestational AgeBirth WeightPregnancy ProteinsMaternal AgeRisk FactorsPregnancy RateRetrospective StudiesEbstein AnomalyParityAntibodies, AntiphospholipidPregnancy TrimestersPlacental InsufficiencyMultiple Birth OffspringPlacentationPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangePregnancy in DiabeticsProspective StudiesPregnancy, TubalAntiphospholipid SyndromeFetal DevelopmentReproductive Techniques, AssistedInfant, Low Birth WeightMaternal WelfareFertilization in VitroFetal Membranes, Premature RupturePregnancy in AdolescenceCohort StudiesDeciduaOdds RatioAbnormalities, MultipleThrombophiliaTreatment OutcomeLogistic ModelsRisk AssessmentPregnancy, UnplannedPregnancy, UnwantedIntraoperative ComplicationsHomocysteineIncidenceInfant, PrematureAbortion, InducedNorwayPregnancy Complications, ParasiticCoronary Vessel AnomaliesTime FactorsPregnancy, ProlongedPelger-Huet AnomalyCase-Control StudiesFetal DiseasesUnited StatesPrevalenceAbnormalities, Drug-InducedFollow-Up StudiesQuestionnaires