Supplementary oxygen therapy in COPD: is it really useful?
Calverley
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PM
D015444:Exercise; D006801:Humans; D000860:Hypoxia / Q000209:etiology / Q000534:rehabilitation*; D008173:Lung Diseases, Obstructive / Q000150:complications / Q000534:rehabilitation*; D010102:Oxygen Inhalation Therapy / Q000379:methods*