Joseph R. Arron, David F. Choy, Michel Laviolette, Steven G. Kelsen et al.
To the Editor: Asthma heterogeneity has been described by the nature and intensity of granulocytic infiltration into the airways [1, 2]. Sputum, endobronchial biopsies and bronchoalveolar lavage (BAL) sample different anatomical regions of the airways. Few studies have directly compared the inflamma...