title: New method of studying clearance topographically form airways of different calibers in man.
mesh_terms: D001980:Bronchi / Q000502:physiology*; D001995:Bronchography; D002923:Cilia / Q000000981:diagnostic imaging / Q000502:physiology*; D006801:Humans; D008722:Methods; D013635:Tantalum; D014132:Trachea / Q000000981:diagnostic imaging / Q000502:physiology*
chemical_list: D013635:Tantalum