Unfortunately, the legend of figure 2⇓ was presented incorrectly as shown and should have appeared as follows.
Fig. 2—
Kaplan–Meier 10-yr survival analysis of the influence of haematocrit (▵: <35%; ▴: 35–39%; ○: 40–44%; •: 45–49%; □: 50–54%; ▪: ≥55%) calculated by the actuarial method in a cohort of 2,524 chronic obstructive pulmonary disease patients with arterial oxygen tension below 7.3 kPa (55 mmHg) being prescribed long-term oxygen therapy. Modified from [13] with permission from the publisher.
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