Systemic VasculitisVasculitisPolyarteritis NodosaAntibodies, Antineutrophil CytoplasmicChurg-Strauss SyndromeWegener GranulomatosisRetinal VasculitisMyeloblastinAnti-Neutrophil Cytoplasmic Antibody-Associated VasculitisArteritisMucocutaneous Lymph Node SyndromeVasculitis, Leukocytoclastic, CutaneousPurpura, Schoenlein-HenochMicroscopic PolyangiitisCogan SyndromeCryoglobulinemiaVasculitis, Central Nervous SystemAutoantibodiesPeroxidaseBehcet SyndromeSerine EndopeptidasesImmunoglobulins, IntravenousOtorhinolaryngologic DiseasesAutoimmune DiseasesGlomerulonephritisImmunosuppressive AgentsAutoantigensGiant Cell ArteritisPrednisoloneNeutrophilsCollagen DiseasesSkin Diseases, VascularRheumatoid VasculitisLeukemia, Myelomonocytic, ChronicMethylprednisoloneCyclophosphamideEnzyme-Linked Immunosorbent AssayImmunoglobulin GLupus Erythematosus, SystemicRespiratory BurstArthritis, RheumatoidRetrospective StudiesFluorescent Antibody Technique, IndirectGlucocorticoidsKidney DiseasesAntibodies, MonoclonalTreatment OutcomeAntibody SpecificityBiological MarkersEndothelium, VascularDrug Therapy, CombinationSeverity of Illness IndexTumor Necrosis Factor-alphaKidneyCytoplasmCase-Control StudiesCryoglobulinsFollow-Up StudiesPolymorphism, GeneticPurpuraGenetic Predisposition to Disease