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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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Footnotes
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Funding This study was funded by the Research and Development Department, South Tees Hospitals NHS Foundation Trust, and the James Cook University Hospital.
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Competing interests None.
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Ethics approval This study was conducted with the approval of the Newcastle and North Tyneside 2 Research Ethics Committee.
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Provenance and peer review Not commissioned; externally peer reviewed.