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  • Determination of smoking status of rheumatoid arthritis patients by means of a self-reported questionnaire and serum cotinine assay: a cross-sectional study

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Determination of smoking status of rheumatoid arthritis patients by means of a self-reported questionnaire and serum cotinine assay: a cross-sectional study

https://doi.org/10.1136/ard.2011.151118

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    Footnotes

    • Funding This study was funded by the Research and Development Department, South Tees Hospitals NHS Foundation Trust, and the James Cook University Hospital.

    • Competing interests None.

    • Ethics approval This study was conducted with the approval of the Newcastle and North Tyneside 2 Research Ethics Committee.

    • Provenance and peer review Not commissioned; externally peer reviewed.