A MULTICENTRE, RANDOMISED, DOUBLE-BLIND, ACTIVE-CONTROLLED, 4-WAY CROSS-OVER STUDY TO EVALUATE THE EFFICACY AND SAFETY OF A FREE COMBINATION OF 3 DOSES OF GLYCOPYRROLATE WITH FIXED COMBINATION BECLOMETHASONE DIPROPIONATE PLUS FORMOTEROL (FOSTER®) IN A METERED DOSE INHALER FOR THE TREATMENT OF PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE (COPD)
