title: What is the difference between oxygen supplementation and mechanical ventilation?
mesh_terms: D045422:Continuous Positive Airway Pressure / Q000379:methods; D006801:Humans; D010100:Oxygen / Q000627:therapeutic use*; D029424:Pulmonary Disease, Chronic Obstructive / Q000628:therapy; D012121:Respiration, Artificial / Q000379:methods*
chemical_list: D010100:Oxygen