Smoking duration, respiratory symptoms, and COPD in adults aged ≥45 years with a smoking history.
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Int J Chron Obstruct Pulmon Dis. 2015 Jul 21;10:1409-16. doi: 10.2147/COPD.S82259. eCollection 2015.
Int J Chron Obstruct Pulmon Dis. 2015.
PMID: 26229460
Free PMC article.