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EasyRespiratoryChronic obstructive pulmonary disease diagnosisuk-plab-1

A 47-year-old man presents with chronic productive cough for 3 months of the year over the last 2 years and frequent winter exacerbations. Spirometry shows FEV1/FVC ratio 0.6. He smokes 20 cigarettes per day. What is the most likely diagnosis?

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