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The continuing challenge of anti-neutrophil cytoplasm antibody-associated systemic vasculitis and glomerulonephritis.

As guest editor for this Frontiers in Nephrology series, it is my job to put the following four articles on small-vessel vasculitis into context for the practicing clinician. I have had an interest in this group of diseases for more than 25 yr, since I first arrived at the Hammersmith Hospital as