Efficacy and safety of direct switch to indacaterol/glycopyrronium in patients with moderate COPD: the CRYSTAL open-label randomised trial by Claus F. Vogelmeier, Mina Gaga, Maryam Aalamian-Mattheis, Timm Greulich, Jose M. Marin, Walter Castellani, Vincent Ninane, Stephen Lane, Xavier Nunez, Francesco Patalano, Andreas Clemens, Konstantinos Kostikas, on behalf of the CRYSTAL study investigators

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