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Forest plot of random‐effects meta‐analysis of C3a levels. 1.3.1 = Anti‐neutrophil cytoplasmic antibody‐associated vasculitis (AAV) patients in active state versus in remission; 1.3.2 = active AAV patients versus healthy controls; 1.3.3 = AAV patients in remission versus healthy controls. Squares are proportional to study weight.
