ANCA associated vasculitis 2 Aged 2 Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis 2 Article 2 Birmingham vasculitis activity score C reactive protein 2 Female 2 Humans 2 Male 2 aged 2 antineutrophil cytoplasmic antibody 2 blood 2 erythrocyte sedimentation rate 2 female 2 human 2 major clinical study 2 male 2 prediction 2 scoring system 2 vasculitis 2 Adult 1 Aged, 80 and over 1 Albumins 1 Biomarkers 1 Fibrinogen 1 Follow-Up Studies 1 Linear Models 1 Middle Aged 1 Progranulins 1 Short Form 36 1