Double Blind, Multinational, Multicentre, Randomised, Placebo-Controlled, 3-Way Cross-Over Study To Evaluate The Effect Of A Triple Combination Of Beclometasone Dipropionate And Formoterol Fumarate Plus Glycopyrronium (CHF5993) And A Dual Combination Of Beclometasone Dipropionate Plus Formoterol Fumarate (CHF1535) Both Administered Via pMDI On Lung Hyperinflation And Exercise Endurance Time In Subjects With Chronic Obstructive Pulmonary Disease (COPD)
