Chronic bronchitis before age 50 years predicts incident airflow limitation and mortality risk | Thorax

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Epidemiology

Chronic bronchitis before age 50 years predicts incident airflow limitation and mortality risk

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Cite this article as:: Guerra S, Sherrill DL, Venker C, et al

Chronic bronchitis before age 50 years predicts incident airflow limitation and mortality risk

Thorax 2009;64:894-900.