title: Lung volumes and "emphysema score" in patients with chronic obstructive lung disease.
mesh_terms: D001991:Bronchitis / Q000503:physiopathology; D006371:Helium; D006801:Humans; D008168:Lung / Q000503:physiopathology*; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008297:Male; D011656:Pulmonary Emphysema / Q000503:physiopathology; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests; D014797:Vital Capacity
chemical_list: D006371:Helium