Umeclidinium/vilanterol as step-up therapy from tiotropium in patients with moderate COPD: a randomized, parallel-group, 12-week study

Por Kerwin, Edward M, Kalberg, Chris J, Galkin, Dmitry V, Zhu, Chang-Qing, Church, Alison, Riley, John H, Fahy, William A
Publicado no Int J Chron Obstruct Pulmon Dis (2017)