1. Global Initiative for Chronic Obstructive Lung Disease. 2021 Report: global strategy for prevention, diagnosis and management of COPD (https://goldcopd.org/2021-gold-reports/).
2. Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the global burden of disease study 2010;Lozano;Lancet,2012
3. The clinical and economic burden of chronic obstructive pulmonary disease in the USA;Guarascio;ClinicoEconomics and outcomes research: CEOR,2013
4. Effect of exacerbation on quality of life in patients with chronic obstructive pulmonary disease;Seemungal;Am J Respir Crit Care Med,1998
5. Effect of exacerbations on quality of life in patients with chronic obstructive pulmonary disease: a 2 year follow up study;Miravitlles;Thorax,2004