Antibodies, AnticardiolipinCardiolipinsLupus Coagulation InhibitorAntiphospholipid Syndromebeta 2-Glycoprotein IAntibodies, AntiphospholipidLupus Erythematosus, SystemicAutoantibodiesAbortion, HabitualImmunoglobulin GImmunoglobulin MAntibodiesThrombosisBlood Coagulation FactorsAntibody SpecificityAntibodies, AntinuclearEnzyme-Linked Immunosorbent AssayThrombophiliaGlycoproteinsImmunoglobulin IsotypesAntibodies, MonoclonalBlood Coagulation TestsProthrombinLupus Vasculitis, Central Nervous SystemPartial Thromboplastin TimeProtein S DeficiencyLeg UlcerPregnancy Complications, HematologicCalciphylaxisActivated Protein C ResistanceAntibodies, ViralPregnancyThrombocytopeniaAbortion, SpontaneousAntibodies, BacterialPregnancy ComplicationsImmunoglobulin AVenous ThrombosisProtein CPrednisoloneProspective StudiesFetal DeathAnticoagulantsAutoimmune DiseasesAntibody FormationAntibodies, NeutralizingPhospholipidsCerebrovascular DisordersCerebral InfarctionCase-Control StudiesImmunoglobulin IdiotypesBiological MarkersRisk FactorsAntibody Affinity