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Erdal M, Johannessen A, Askildsen JE et al. Productivity losses in chronic obstructive pulmonary disease: a population-based survey. BMJ Open Resp Res 2014;1:e000049. doi:10.1136/bmjresp-2013-000049

The second sentence of the Design section of the article has been amended to read: The latter were defined by an increase in two major symptoms (dyspnoea, sputum volume or sputum colour) or one major and one minor symptom (cough, sore throat, nasal secretion, wheezing or asthaenia) for at least two consecutive days (modified Anthonisen criteria).

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