Pregnancy ComplicationsPregnancyPregnancy OutcomePre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstIncidencePregnancy, EctopicAbortion, SpontaneousPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePremature BirthPregnancy, AnimalPlacentaPostoperative ComplicationsPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdCivil DisordersPlacenta DiseasesInfant, NewbornPregnancy Complications, InfectiousEclampsiaObstetric Labor, PrematurePregnancy, TwinGestational AgePlacental CirculationCongenital AbnormalitiesFetal DeathDiabetes, GestationalTrophoblastsRisk FactorsPreconception CarePregnancy, High-RiskPregnancy, MultipleCesarean SectionObstetric Labor ComplicationsRetrospective StudiesStillbirthPrenatal CareUterusInfant, Small for Gestational AgeAbortion, HabitualUltrasonography, PrenatalBirth WeightPregnancy ProteinsMaternal AgePregnancy RateProspective StudiesParityAntibodies, AntiphospholipidPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangeCohort StudiesPregnancy in DiabeticsPregnancy, TubalAntiphospholipid SyndromeInfant, Low Birth WeightReproductive Techniques, AssistedMaternal WelfareFetal DevelopmentFertilization in VitroTreatment OutcomeFetal Membranes, Premature RuptureOdds RatioPregnancy in AdolescenceRisk AssessmentDeciduaLogistic ModelsThrombophiliaTime FactorsIntraoperative ComplicationsPregnancy, UnplannedFollow-Up StudiesUnited StatesPregnancy, UnwantedNorwayHomocysteinePrevalenceInfant, PrematureCase-Control StudiesPregnancy Complications, ParasiticConfidence IntervalsPregnancy, ProlongedQuestionnairesAbortion, InducedPregnancy, AbdominalDiabetes ComplicationsBiological MarkersEmbryo TransferEmbryo Implantation