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Burden and treatment of chronic obstructive pulmonary disease among people using illicit opioids: matched cohort study in England

Lewer D, Cox S, Hurst JR, et al

BMJ Medicine 2022;1:e000215. doi: 10.1136/bmjmed-2022-000215 

https://bmjmedicine.bmj.com/content/1/1/e000215