Definition and Nomenclature of Chronic Obstructive Pulmonary Disease: Time for Its Revision

Complex diseases may be defined by  combining two or more characteristics, ‘but independent of the characteristics used, once a definition is agreed on, itis practical to adopt a nomenclature that uses names and terms to classify subgroups within the disease than share similar characteristics. It follows that the definition and classification of diseases can and should change over time.

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