title: Intrathoracic tracheal collapsibility--a cineradiographical study.
mesh_terms: D002933:Cineradiography; D006801:Humans; D007223:Infant; D007442:Intubation, Intratracheal; D008365:Manometry; D012123:Pulmonary Ventilation; D012119:Respiration; D012131:Respiratory Insufficiency / Q000000981:diagnostic imaging*; D014132:Trachea / Q000000981:diagnostic imaging*