Oxygen therapy in chronic obstructive pulmonary disease.
D002908:Chronic Disease; D005260:Female; D006801:Humans; D008171:Lung Diseases / Q000628:therapy*; D008297:Male; D010102:Oxygen Inhalation Therapy; D011656:Pulmonary Emphysema / Q000628:therapy*; D012131:Respiratory Insufficiency / Q000628:therapy*