Chronic Obstructive Pulmonary Disease — Effect of Roflumilast in Chronic Obstructive Pulmonary Disease (COPD) Patients Treated With Tiotropium: The HELIOS Study (BY217/M2-128)
Citation(s)
Effect of Roflumilast in COPD Patients Treated With Tiotropium. A 24-week, Double-blind Study With 500 µg Roflumilast Once Daily Versus Placebo. The HELIOS Study