VasculitisAntibodies, Antineutrophil CytoplasmicAnti-Neutrophil Cytoplasmic Antibody-Associated VasculitisMyeloblastinWegener GranulomatosisSystemic VasculitisRetinal VasculitisChurg-Strauss SyndromeAntibodiesVasculitis, Central Nervous SystemPolyarteritis NodosaMicroscopic PolyangiitisAntibody SpecificityGlomerulonephritisPeroxidaseAutoantibodiesPurpura, Schoenlein-HenochSkin Diseases, VascularFluorescent Antibody Technique, IndirectAntibodies, MonoclonalSerine EndopeptidasesAntibodies, ViralPropylthiouracilNeutrophilsRheumatoid VasculitisVasculitis, Leukocytoclastic, CutaneousAntibodies, BacterialAntithyroid AgentsEnzyme-Linked Immunosorbent AssayAntibodies, AntinuclearFluorescent Antibody TechniqueImmunosuppressive AgentsAutoimmune DiseasesCryoglobulinemiaImmunoglobulin GAntibody FormationAntibodies, NeutralizingArteritisAutoantigensAntibodies, Monoclonal, Murine-DerivedPrednisoloneNeutrophil ActivationAntibody AffinityCyclophosphamideLysosomal-Associated Membrane Protein 2Endocarditis, Subacute BacterialMucocutaneous Lymph Node SyndromePlasma ExchangeBiological MarkersAntibodies, Anti-Idiotypic