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