Microscopic PolyangiitisAntibodies, Antineutrophil CytoplasmicVasculitisWegener GranulomatosisPolyarteritis NodosaChurg-Strauss SyndromeMyeloblastinAnti-Neutrophil Cytoplasmic Antibody-Associated VasculitisVasculitis, Leukocytoclastic, CutaneousSystemic VasculitisPeroxidaseGlomerulonephritisPlasma ExchangeAntibodiesImmunosuppressive AgentsSkin Diseases, VascularPrednisoloneCyclophosphamideMethylprednisoloneFluorescent Antibody Technique, IndirectIleal DiseasesSerine EndopeptidasesAntibody SpecificityAdrenal Cortex HormonesHemorrhageLung DiseasesUlcerGlucocorticoidsAntibodies, ViralEnzyme-Linked Immunosorbent AssayBiopsyRecurrenceAntibodies, MonoclonalKidney DiseasesAntibodies, BacterialAutoantibodiesPropylthiouracilTreatment OutcomeNeutrophils