Smoking duration, respiratory symptoms, and COPD in adults aged ≥45 years with a smoking history

  • Yong Liu, Roy Pleasants, Janet Croft, Anne Wheaton, Khosrow Heidari, Ann Malarcher, Jill Ohar, Monica Kraft, David Mannino, Charlie Strange
  • International Journal of Chronic Obstructive Pulmonary Disease, July 2015, Dove Medical Press
  • DOI: 10.2147/copd.s82259

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