title: Oxygen therapy. Evaluation of various air-entraining masks.
mesh_terms: D005069:Evaluation Studies as Topic; D006331:Heart Diseases / Q000628:therapy; D006801:Humans; D008171:Lung Diseases / Q000628:therapy; D008397:Masks; D010102:Oxygen Inhalation Therapy / Q000295:instrumentation*; D013147:Spirometry