Antibodies, AnticardiolipinCardiolipinsLupus Coagulation InhibitorAntiphospholipid Syndromebeta 2-Glycoprotein IAntibodies, AntiphospholipidAutoantibodiesLupus Erythematosus, SystemicImmunoglobulin MImmunoglobulin GAbortion, HabitualAntibodiesThrombosisAntibodies, AntinuclearEnzyme-Linked Immunosorbent AssayBlood Coagulation FactorsAntibody SpecificityThrombophiliaGlycoproteinsFocal InfectionImmunoglobulin IsotypesAntibodies, ViralAntibodies, MonoclonalBlood Coagulation TestsProthrombinLupus Vasculitis, Central Nervous SystemPartial Thromboplastin TimeProtein S DeficiencyLeg UlcerPregnancy Complications, HematologicCalciphylaxisActivated Protein C ResistanceProspective StudiesPregnancyThrombocytopeniaAbortion, SpontaneousAntibodies, BacterialBiological MarkersPregnancy ComplicationsImmunoglobulin AVenous ThrombosisProtein CPrednisoloneRisk FactorsRecurrenceSensitivity and SpecificityFetal DeathAnticoagulantsAutoimmune DiseasesAntibody FormationAntibodies, NeutralizingHepatitis BRetrospective StudiesHepatitis B Surface AntigensPhospholipidsCerebrovascular DisordersCerebral InfarctionCase-Control StudiesImmunoglobulin IdiotypesAntibody AffinityPolymerase Chain Reaction