This article was originally published with an error in the key to the symbols in figure 3. The corrected figure is shown below and has been corrected in the article itself.
Absolute changes from baseline in key outcome measures at 3 and 6 months post-allocation to endoscopic lung volume reduction (ELVR) group, no-ELVR group and lung volume reduction surgery (LVRS) group. Data presented are mean±sem for a) forced expiratory volume in 1 s (FEV1), b) residual volume (RV), c) 6-min walk distance (6MWD) and d) St George's Respiratory Questionnaire (SGRQ) total score.
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