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2. World Health Organization. Chronic obstructive pulmonary disease (COPD) fact sheet; 2021. https://www.who.int/news-room/fact-sheets/detail/chronic-obstructive-pulmonary-disease-copd. Accessed August 18, 2021.
3. Global Initiative for Chronic Obstructive Lung Disease. Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary Disease: 2020 Report; 2020.
4. Understanding the impact of chronic obstructive pulmonary disease exacerbations on patient health and quality of life