[Abstract] Chronic obstructive pulmonary disease (COPD) is an important cause of morbidity and mortality with high social and economic costs. The prevalence of COPD has been reported to vary between 6 and 26.1% worldwide.1 COPD has also been associated with a high prevalence of one or more comorbid conditions, which have an impact on health status and mortality.2–5 Although several diseases have been studied as...