title: Diffusion in closed-circuit equilibration curves in obstructive lung disease.
mesh_terms: D002849:Chromatography, Gas; D003202:Computers, Analog; D004058:Diffusion; D005459:Fluorides; D006371:Helium; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008954:Models, Biological; D008961:Models, Structural; D012119:Respiration; D012129:Respiratory Function Tests; D013147:Spirometry
chemical_list: D006371:Helium; D005459:Fluorides