Current smoking status is a strong predictor of radiographic progression in early rheumatoid arthritis: results from the SWEFOT trial.

Saevarsdottir S, Rezaei H, Geborek P, Petersson I, Ernestam S, Albertsson K, Forslind K, van Vollenhoven RF; SWEFOT study group. Ann Rheum Dis. 2015 Aug;74(8):1509-14.