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Carrera, M., Sala, E., & Agustí, A. (2008-10). Chronic medical therapy and the GOLD guidelines. In Chronic Obstructive Pulmonary Disease (COPD) (Oxford Respiratory Medicine Library). Oxford, UK: Oxford University Press. Retrieved 29 Mar. 2020, from https://oxfordmedicine.com/view/10.1093/med/9780199549146.001.0001/med-9780199549146-chapter-6.