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A new statistical method for evaluating long-term analytical performance of laboratories applied to an external quality assessment scheme for flow cytometry.

excessive variability; the third step detected three regression lines with exceeding bias. CONCLUSIONS: The methodology allows assessment of the long-term performance of laboratories, taking into account ...

Current practices in antinuclear antibody testing: results from the Belgian External Quality Assessment Scheme.

sent for analysis. Participants were surveyed for methodology used and were asked to report staining pattern and titer of ANA s. In 2002, an attempt was made to improve the comparability of quantitative ...

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