Long-term oxygen therapy in COPD.
D003365:Costs and Cost Analysis; D005260:Female; D006801:Humans; D008134:Long-Term Care; D008173:Lung Diseases, Obstructive / Q000628:therapy*; D008297:Male; D010102:Oxygen Inhalation Therapy / Q000009:adverse effects / Q000191:economics / Q000379:methods*