title: Is 12-hour oxygen as effective as 24-hour oxygen in advanced chronic obstructive pulmonary disease with hypoxemia? (The nocturnal oxygen therapy trial--NOTT)
mesh_terms: D006801:Humans; D000860:Hypoxia / Q000150:complications / Q000628:therapy*; D008173:Lung Diseases, Obstructive / Q000150:complications / Q000628:therapy*; D010100:Oxygen / Q000008:administration & dosage* / Q000097:blood / Q000627:therapeutic use
chemical_list: D010100:Oxygen