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Read the full analysis: http://www.bmj.com/content/351/bmj.h3021 The prevalence and mortality of chronic obstructive pulmonary disease (COPD) is increasing globally.

However, Martin Miller, honorary professor of medicine at the University of Birmingham, and Mark Levy, GP with a special interest in respiratory medicine, argue that the GOLD (Global Initiative for Obstructive Lung Disease) criteria used for diagnosis may be leading to misdiagnosis.