Efect of multiple comorbidities on mortality in chronic obstructive pulmonary disease among Korean population: A nationwide cohort study

The effects of comorbidities on chronic obstructive pulmonary disease (COPD) have been usually studied individually in the past. In this study, we aimed to investigate the comorbidities associated with mortality, the effect of multimorbidity on mortality and other factors associated with mortality among Korean COPD population.