Fig. 1.
Diagram classifying patients with isolated asthma, isolated COPD and ACOS according to study definition. COPD, chronic obstructive pulmonary disease; ACOS, asthma and COPD overlap syndrome; BD, bronchodilator; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; HRCT, high resolution computed tomography.



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