Flow Rate Effect Respimat Inhaler Versus a Metered Dose Inhaler Using Berodual in Patients With Chronic Obstructive Pulmonary Disease (COPD) [clinicaltrials:NCT00153075]

Flow Rate Effect Respimat Inhaler Versus a Metered Dose Inhaler Using Berodual in Patients With Chronic Obstructive Pulmonary Disease (COPD) [clinicaltrials:NCT00153075]