title: Urban factor and tracheobronchial clearance.
mesh_terms: D000336:Aerosols; D002000:Bronchospirometry; D004781:Environmental Exposure; D005260:Female; D006801:Humans; D007553:Isotope Labeling; D008297:Male; D008875:Middle Aged; D009790:Occupations; D010316:Particle Size; D011138:Polytetrafluoroethylene; D011247:Pregnancy; D012044:Regression Analysis; D012129:Respiratory Function Tests; D012140:Respiratory Tract Diseases / Q000401:mortality* / Q000503:physiopathology; D012424:Rural Population; D012907:Smoking / Q000503:physiopathology; D013548:Sweden; D013667:Technetium; D014427:Twins; D014505:Urban Population
chemical_list: D000336:Aerosols; D013667:Technetium; D011138:Polytetrafluoroethylene