Emphysema predicts hospitalisation and incident airflow obstruction among older smokers: a prospective cohort study. af David A McAllister, Firas S Ahmed, John H M Austin, Claudia I Henschke, Brad M Keller, Adina Lemeshow, Anthony P Reeves, Sonia Mesia-Vela, G D N Pearson, Maria C Shiau, Joseph E Schwartz, David F Yankelevitz, R Graham Barr

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