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(a) The correlation of the relative avidity index as measured with a urea concentration of 5 M and 3 M. (b) The correlation of the anti‐neutrophil cytoplasmic antibodies (ANCA) level as measured in phosphate‐buffered saline (PBS) with the relative avidity index as measured with a urea concentration of 3 M. (c) The correlation of the ANCA level as measured in PBS with the relative avidity index as measured with a urea concentration of 5 M.
