Annals of internal medicine
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Chronic obstructive pulmonary disease (COPD) is characterized by frequent exacerbations. ⋯ Agency for Healthcare Research and Quality. (PROSPERO: CRD42018111609).
Chronic obstructive pulmonary disease (COPD) is characterized by frequent exacerbations. ⋯ Agency for Healthcare Research and Quality. (PROSPERO: CRD42018111609).