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. 2015 Aug 27;25:15056. doi: 10.1038/npjpcrm.2015.56

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Copyright © 2015 Primary Care Respiratory Society UK/Macmillan Publishers Limited

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Random-effects meta-analysis of the proportion of eligible ever smokers diagnosed with COPD when opportunistically invited for spirometry (restricted to studies that defined airflow obstruction as FEV₁/FVC<0.7).