Efficacy and safety of nebulized formoterol as add-on therapy in COPD patients receiving maintenance tiotropium bromide: Results from a 6-week, randomized, placebo-controlled, clinical trial.

Efficacy and safety of nebulized formoterol as add-on therapy in COPD patients receiving maintenance tiotropium bromide: Results from a 6-week, randomized, placebo-controlled, clinical trial. Drugs. 2009 Jun 18; 69(9):1205-16.

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