This multicentre , blinded , triple-dummy , parallel-group , non-inferiority study randomised patients aged @years with moderate-to-severe COPD ( post-bronchodilator forced expiratory volume in @s ( FEV@ ) @ % to < @ % predicted ) to QVA@ @/@g o.d. or TIO @g o.d. + FOR @g twice daily ( @:@ ) for @weeks .