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Despite wide use of the Global Initiative for Chronic Obstructive Pulmonary Disease (GOLD) 2011, little is known about between-stage transitions and what factors predict worsening transitions in patients with chronic obstructive pulmonary disease (COPD).

<p>2011 GOLD Stages of COPD: Transitions, Predictor Factors and Comparison with 2017 GOLD Stages</p>