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Pavlov, Nikolay; Haynes, Alan Gary; Stucki, Armin; Jüni, Peter; Ott, Sebastian Robert (2018). Long-term oxygen therapy in COPD patients: population-based cohort study on mortality. International Journal of Chronic Obstructive Pulmonary Disease, 13, pp. 979-988. Dove Medical Press 10.2147/COPD.S154749
