WarfarinAnticoagulantsVenous ThromboembolismThromboembolismPulmonary EmbolismVenous ThrombosisHemorrhageHeparin, Low-Molecular-WeightVitamin K Epoxide ReductasesProthrombin TimeThrombophlebitisBlood CoagulationThrombophiliaLupus Coagulation InhibitorVitamin KHeparinbeta-AlanineAtrial FibrillationAcenocoumarolRodenticidesProtein CPartial Thromboplastin TimeThrombosisProthrombinAntithrombinsInternational Normalized RatioEnoxaparinFibrin Fibrinogen Degradation ProductsFactor Xa4-HydroxycoumarinsBlood Coagulation TestsRisk FactorsFactor VBlood Coagulation FactorsFibrinolytic AgentsAdministration, OralPhenindioneProtein SAspirinAntiphospholipid SyndromeThrombin TimeVena Cava FiltersActivated Protein C ResistanceThiophenesRecurrenceStrokeStockings, CompressionBlood Coagulation DisordersThrombinMixed Function OxygenasesTreatment OutcomePlatelet Aggregation InhibitorsAntibodies, AntiphospholipidThrombomodulinDalteparinBenzimidazolesPyridonesDrug MonitoringIncidenceAntithrombin IIIRetrospective StudiesProtein C DeficiencyProspective Studies