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Azithromycin maintenance treatment in patients with frequent exacerbations of chronic obstructive pulmonary disease (COLUMBUS): a randomised, double-blind, placebo-controlled trial

Frequent ExacerbationsAzithromycin Maintenance TreatmentAntibioticsAdvanced Lung DiseasePlacebo-controlled TrialPulmonary MedicinePharmacotherapyMedicinePulmonary Disease