Eur Respir J The European Respiratory Journal article-version (VoR) Version of Record Halpin, D M G, Dransfield, M T, Han, M L K, Elaine Jones, C, Kilbride, S, Lange, P, Lipson, D A, Lomas, D A, Martinez, F J, Pascoe, S, Singh, D, Wise, R & Criner, G J 2020, ' The effect of exacerbation history on outcomes in the IMPACT trial ', European Respiratory Journal, vol. 55, no. 5, 1901921 . https://doi.org/10.1183/13993003.01921-2019