International variation in the prevalence of COPD (The BOLD Study): a population-based prevalence study

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Buist AS, McBurnie MA, Vollmer WM, Gillespie S, Burney PG, Mannino DM, et al. International variation in the prevalence of COPD (The BOLD Study): a population-based prevalence study. Lancet. 2007;370(9589):741-50. PDF