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Lewer, Dan and Cox, Sharon and Hurst, John R and Padmanathan, Prianka and Petersen, Irene and Quint, Jennifer K (2022) Burden and treatment of chronic obstructive pulmonary disease among people using illicit opioids: matched cohort study in England. BMJ Medicine, 1, e000215. doi: 10.1136/bmjmed-2022-000215.