Tiotropium Bromide Alone vs Tiotropium Bromide and Formoterol Fumarate in Subjects With COPD (Study P04272)

A Double-Blind Randomized, Parallel-Group, Multicenter Clinical Study to Compare the Efficacy and Tolerability of Tiotropium Bromide Alone vs. the Co-Administration of Tiotropium Bromide and Formoterol Fumarate in Subjects With COPD