This article was originally published with an error in figure 2 in which part a was a duplication of part b. The corrected figure is shown below. This has now been corrected in the article itself. The authors apologise for this error.
FIGURE 2
Level of control in a) high oral corticosteroid users and b) low oral corticosteroid users. Rounding differences may be observed for these data. GINA: Global Initiative for Asthma.
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