Erratum

After publication of this work [1], regrettably we noted that there were two errors in the illustrations, which were added when the paper was under revision and inadequately checked.

In Table 1, when describing the BODE data, the median value was 2, so instead of BODE index† 4 (0-6), the correct one is BODE index† 2 (0-6).

Figure two was plotted with incorrect percentages. The correct Figure two is shown next (see Figure 1).

Figure 1
figure 1

Distribution of patients with COPD at baseline according to GOLD 2007 and GOLD 2013 classification.

Full size image