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Treatment with tumour necrosis factor α antagonists in patients with rheumatoid arthritis induces anticardiolipin antibodies
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    Mischievous data mining of Registry Data

    Dear Editor

    We read with interest the recent article of Jonsdottir and colleagues,[1] in which the authors describe an increase in the rate of ACLA in RA patients who received any anti-TNF therapy; a potentially very interesting finding. However, this article commits multiple errors in scientific methodology and we are concerned that the presumed apparent correlations of ACLA are actually the result of inherent b...

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    Conflict of Interest:
    None declared.