you have to use this article as a start point ((Brill SE and Wedzicha JA. Oxygen therapy in acute exacerbations of chronic obstructive pulmonary disease. International Journal of COPD. (2014) 9: 1241-1252.))) you can find it in google schooler also make sure you use google schooler for the rest of the references also make sure all the references are available and accessible.
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