1. Global Initiative for Chronic Obstructive Lung Disease. Global strategy for the diagnosis, management, and prevention of chronic obstructive lung disease. Updated 2019. Available from https://goldcopd.org/wp-content/uploads/2018/11/GOLD-2019-v1.7-FINAL-14Nov2018-WMS.pdf. Accessed 25 Aug 2022
2. World Health Organization (2019) Chronic obstructive pulmonary disease (COPD). http://www.who.int/respiratory/copd/en/webcite
3. Rabe KF, Hurd S, Anzueto A et al (2007) Global strategy for the diagnosis, management, and prevention of COPD—2006 Update. Am J Respir Crit Care Med. Published online May 16. https://doi.org/10.1164/rccm.200703-456SO
4. Global Strategy for the Diagnosis, Management, and Prevention of Chronic Obstructive Pulmonary Disease: 2019 Report (2019) Fontana, WI: Global Initiative for Chronic Obstructive Lung Disease (GOLD). https://goldcopd.org/wp-content/uploads/2018/11/GOLD-2019-v1.7-FINAL-14Nov2018-WMS.pdfwebcite. PubMed: 17507545
5. MacIntyre N, Huang YC (2008) Acute exacerbations and respiratory failure in chronic obstructive pulmonary disease. Proc Am Thorac Soc 5(4):530–535. https://doi.org/10.1513/pats.200707-088ET.PMID:18453367;PMCID:PMC2645331