Efficacy and safety of once-daily QVA149 compared with the free combination of once-daily tiotropium plus twice-daily formoterol in patients with moderate-to-severe COPD (QUANTIFY): a randomised, non-inferiority study
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S. Korn | R. Buhl | C. Gessner | C. Sieder | K. Foerster | Wolfgang Schuermann | S. Hiltl