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Page 1 of 1 (page number not for citation purposes) It has been brought to our attention that Figure 2b in our recently published paper [1] contains an error. Specifically, we inadvertently entered –6.4 rather than +6.4 for the Nadaskevich paper [2] reported in Figure 2b. Recalculation of the summary estimate for diffusing lung capacity of carbon monoxide (DLCO) in this figure revealed a summary mean difference of 3.74, with 95% confidence interval (0.09 to 7.40). This effect is now statistically significant, although the overall conclusion of our meta-analysis, that cyclophosphamide treatment did not result in clinically significant improvement of pulmonary function, is unchanged by this recalculation, as the improvement remains less than the predefined criterion of 10%. The corrected figure 2b is given here as Figure 1. References 1. Nannini C, West CP, Erwin PJ, Matteson EL: Effects of cyclophosphamide on pulmonary function in patients with scleroderma and interstitial lung disease: a systematic review and meta-analysis of randomized controlled trials and observational prospective cohort studies. Arthritis Res Ther 2008, 10:R124. 2. Nadashkevich O, Davis P, Fritzler M, Kovalenko W: A randomized unblinded trial of cyclophosphamide versus azathioprine in the treatment of systemic sclerosis. Clin Rheumatol 2006, 25:205-212. Correction Correction: Effects of cyclophosphamide on pulmonary function in patients with scleroderma and interstitial lung disease: a systematic review and meta-analysis of randomized controlled trials and observational prospective cohort studies Carlotta Nannini1, Colin P West2,3, Patricia J Erwin4 and Eric L Matteson1

arthritis research and therapy

Correction: Effects of cyclophosphamide on pulmonary function in patients with scleroderma and interstitial lung disease: a systematic review and meta-analysis of randomized controlled trials and observational prospective cohort studies