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[Correspondence] Chronic obstructive pulmonary disease: time to discuss new concepts

The adoption of precise concepts, decades ago, is one of the landmarks that has allowed enhancement of the knowledge about chronic obstructive pulmonary disease (COPD).1,2 Chronic bronchitis is clinically characterised, emphysema is pathologically defined, and COPD is defined as a respiratory function abnormality. These classic definitions are still the foundations for appropriate clinical communication and scientific discussions.3