title: The biphasic spirogram: a clue to unilateral narrowing of a mainstem bronchus.
mesh_terms: D001980:Bronchi / Q000503:physiopathology*; D001982:Bronchial Diseases / Q000503:physiopathology*; D006801:Humans; D008449:Maximal Expiratory Flow-Volume Curves / Q000502:physiology