Pregnancy ComplicationsPregnancyThrombosisPregnancy OutcomeVenous ThrombosisPre-EclampsiaHypertension, Pregnancy-InducedPregnancy Complications, CardiovascularPregnancy Complications, HematologicFemale Urogenital Diseases and Pregnancy ComplicationsPregnancy Trimester, FirstAbortion, SpontaneousPregnancy, EctopicPregnancy Complications, NeoplasticFetal Growth RetardationAbruptio PlacentaePremature BirthPregnancy, AnimalPlacentaPregnancy Trimester, SecondUterine ArteryPregnancy Trimester, ThirdPlacenta DiseasesCivil DisordersPostoperative ComplicationsPregnancy Complications, InfectiousEclampsiaCoronary ThrombosisPregnancy, TwinObstetric Labor, PrematureInfant, NewbornSinus Thrombosis, IntracranialGestational AgeFetal DeathPlacental CirculationTrophoblastsDiabetes, GestationalCongenital AbnormalitiesPreconception CareRisk FactorsPregnancy, High-RiskCesarean SectionPregnancy, MultipleObstetric Labor ComplicationsAntibodies, AntiphospholipidAbortion, HabitualStillbirthRetrospective StudiesPrenatal CareUterusInfant, Small for Gestational AgeIntracranial ThrombosisAntiphospholipid SyndromeUltrasonography, PrenatalThrombophiliaPregnancy ProteinsBirth WeightPregnancy RateCarotid Artery ThrombosisMaternal AgeProspective StudiesParityPlacental InsufficiencyPregnancy TrimestersPlacentationMultiple Birth OffspringPregnancy TestsDelivery, ObstetricMaternal-Fetal ExchangeTreatment OutcomePregnancy in DiabeticsPregnancy, TubalAnticoagulantsMaternal WelfareCohort StudiesReproductive Techniques, AssistedFetal DevelopmentInfant, Low Birth WeightFertilization in VitroFetal Membranes, Premature RuptureOdds RatioPregnancy in AdolescenceRisk AssessmentDeciduaTime FactorsLogistic ModelsIncidencePhlebographyFollow-Up StudiesSagittal Sinus ThrombosisHomocysteineIntraoperative ComplicationsPregnancy, UnplannedPregnancy, UnwantedIntracranial Embolism and ThrombosisCase-Control StudiesFemoral VeinNorwayIliac VeinInfant, Premature