Distribution function of the clearance time constant in lungs.
D000328:Adult; D000368:Aged; D001249:Asthma / Q000503:physiopathology*; D006371:Helium; D006801:Humans; D008168:Lung / Q000502:physiology*; D008433:Mathematics; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000503:physiopathology*; D011658:Pulmonary Fibrosis / Q000503:physiopathology*; D013147:Spirometry; D014397:Tuberculosis, Pulmonary / Q000503:physiopathology*
D006371:Helium