title: Pulmonary airway clearance mechanisms: a reappraisal.
mesh_terms: D000818:Animals; D001980:Bronchi / Q000502:physiology; D006801:Humans; D008168:Lung / Q000502:physiology*; D008954:Models, Biological; D009093:Mucus / Q000502:physiology*; D012212:Rheology