Efficacy and safety of NVA237 versus placebo and tiotropium in patients with COPD: the GLOW2 study
Edward Kerwin, Jacques Hébert, Nicola Gallagher, Carmen Martin, Tim Overend, Vijay K.T. Alagappan, Yimeng Lu, Donald Banerji
European Respiratory Journal Nov 2012, 40 (5) 1106-1114; DOI: 10.1183/09031936.00040712