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Associations between levels of urinary urinary secretory immunoglobulin A (sIgA) and clinical parameters of IgA nephropathy (IgAN) patients. (a) Correlation between levels of urinary sIgA and creatinine clearance; (b) correlation between levels of urinary sIgA and serum creatinine; (c) correlation between levels of urinary sIgA and the quantity of proteinuria; (d) correlation between levels of urinary sIgA and serum IgA.
