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Vitamin D deficiency is common in patients with RA and linked to disease activity, but circulating levels are unaffected by TNFα blockade: results from a prospective cohort study

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Footnotes

  • PW and MJLP are joint first authors

  • MTN and NS are joint senior authors

  • Deceased

  • Funding This study was facilitated by the Clinical Research Bureau of the Jan van Breemen Institute which receives financial support from the Dutch Arthritis Association. MJP received a EULAR bursary and this research was conducted while he was an ARTICULUM Fellow.

  • Competing interests None.

  • Ethics approval This study was conducted with the approval of the local ethics committee.

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

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