Mannino DM. COPD: epidemiology, prevalence, morbidity and mortality, and disease heterogeneity. Chest. 2002;121(5 Suppl):S121–6.
Sigurgeirsdottir J, Halldorsdottir S, Arnardottir RH, Gudmundsson…

Mannino DM. COPD: epidemiology, prevalence, morbidity and mortality, and disease heterogeneity. Chest. 2002;121(5 Suppl):S121–6.
Sigurgeirsdottir J, Halldorsdottir S, Arnardottir RH, Gudmundsson…