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    Article

    Severe deficiency of 25-hydroxyvitamin D3 (25-OH-D3) is associated with high disease activity of rheumatoid arthritis

    This study aims to measure the serum level of 25-hydroxyvitamin D3 (25-OH-D3) in 302 patients with rheumatoid arthritis (RA), studying the association to disease activity. Three hundred two RA patients underwent ...

    Hans-Jacob Haga, Anne Schmedes, Yusuf Naderi, Alicia Martin Moreno in Clinical Rheumatology (2013)