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Comparison of the receiver operating characteristic (ROC) curves for the detection of a severe aseptic lymphocyte-dominated vasculitis-associated lesion (ALVAL) response and/or suboptimal taper performance (SOTP) for whole blood cobalt (Co) concentration versus whole blood chromium (Cr) to serum Cr ratio. The area under the curve (AUC) for Co (0.39) was significantly different to that for the blood Cr to serum Cr ratio (0.70; p < 0.001).
