Smoking at onset of rheumatoid arthritis (RA) and its effect on disease activity and functional status: experiences from BARFOT, a long-term observational study on early RA.
Söderlin MK, Petersson IF, Bergman S, Svensson B; BARFOT study group.
Scand J Rheumatol. 2011;40(4):249-55.
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