Antibodies, AntiphospholipidAntiphospholipid SyndromeAntibodies, AnticardiolipinLupus Coagulation Inhibitorbeta 2-Glycoprotein IThrombosisVenous ThrombosisCardiolipinsLupus Erythematosus, SystemicAntibodiesAbortion, HabitualThrombophiliaSneddon SyndromeImmunoglobulin GAutoantibodiesAntibody SpecificityAnticoagulantsCatastrophic IllnessAntibodies, MonoclonalGlycoproteinsPartial Thromboplastin TimeHydroxychloroquinePregnancy Complications, HematologicPregnancy ComplicationsImmunoglobulin MSkin Diseases, VascularPregnancyLupus Vasculitis, Central Nervous SystemProthrombinAntibodies, ViralWarfarinPhospholipidsPanniculitis, Lupus ErythematosusAbortion, SpontaneousCoronary ThrombosisAntibodies, BacterialSinus Thrombosis, IntracranialActivated Protein C ResistanceAnetodermaAntibodies, AntinuclearThromboembolismAspirinFactor VBlood Coagulation FactorsBinding Sites, AntibodyThromboplastinHeparin, Low-Molecular-WeightPulmonary EmbolismBlood CoagulationEnzyme-Linked Immunosorbent AssayAnnexin A5HeparinRisk FactorsAntibody FormationAntibodies, NeutralizingGangreneThrombocytopeniaFetal DeathAutoimmune DiseasesThrombin TimePhosphatidylserinesIntracranial ThrombosisMyelitis, TransverseProtein CEclampsiaAntibody AffinityVenous ThromboembolismEpitopesTrophoblastsCarotid Artery ThrombosisPregnancy OutcomeProtein S DeficiencyEndocarditisProspective StudiesBlood Coagulation TestsThrombophlebitisHLA-DR2 AntigenBiological MarkersFluorescent Antibody TechniqueRetrospective StudiesFibrinolytic AgentsHeart Valve DiseasesInternational Normalized RatioPlacental InsufficiencyBlood Coagulation DisordersVasculitisCerebrovascular DisordersAntibodies, Anti-IdiotypicRecurrenceImmunoglobulin APrednisoloneEmbryo ImplantationRetinal Artery OcclusionBlood PlateletsProtein SCross ReactionsFollow-Up StudiesTreatment OutcomeFatal OutcomeEndothelium, Vascular