[American Thoracic Society American Thoracic Society 2011 International Conference, May 13-18, 2011 • Denver Colorado - ()] B93. COPD EXACERBATIONS: IMPACT OF BACTERIAL AND VIRAL INFECTIONS - COPD Patients With Chronic Purulent Sputum Have More Frequent COPD Exacerbations And Require More Frequent Treatment With Antibiotics

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