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Relationship of plasma calcium and 1,25 dihydroxyvitamin D concentrations. Scatterplot and linear regression demonstrating the correlation of plasma corrected calcium and 1,25 dihydroxyvitamin D (r2 = 0.79, P = 0.0001, β-coefficient = 0.002). Values represent measurements for all patients from pre-treatment until immediately after the final plasma exchange.
