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Initial and 4-year follow-up levels of (a) serum total IgG, (b) serum total IgA, and (c) serum Gd-IgA1 normalized for serum total IgA. Panels (d, e, f) represent scatter plots of initial (x-axis) versus follow-up (y-axis) values. P-values correspond to the Pearson’s test of correlation; r2: squared correlation coefficient.
