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Correlation analysis between the percentage of CD4+ (a) and CD8+ (b) bronchoalveolar lavage (BAL) T lymphocytes with positive intracellular staining for type 2 cytokines [interleukin (IL)-4, IL-10 and IL-13] and the degree of airflow obstruction [forced expiratory volume in 1 s (FEV1), % reference] in smokers [with and without chronic obstructive pulmonary disease (COPD)].
