Faster Onset of Bronchodilation with Formoterol than with Salmeterol in Patients with Stable, Moderate-Severe Copd: Results of a Randomized, Double-Blind Clinical Study oleh John Kottakis, Giovanni Della Cioppa, Jacques Creemers, Louis Greefhorst, Violette Leclerc, Riccardo Pistelli, Tim Overend, Denise Till, Günter Rapatz, Vincent LeGros, Demosthenes Bouros, Nikolaos Siafakas