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Bland-Altman plots of the agreement of plasma level measurements from the HRP2 bioassay and the isotopic bioassay (mean difference on a log scale, −0.02; limits of agreement, −0.164 and 0.118), as well as from the HRP2 bioassay and HPLC-ECD (mean difference on a log scale, 0.00; limits of agreement, −0.269 and 0.271).
