Donohue IF, Bollu VK, Stull DE, Nelson LM, Williams VS, Stensland MD, Hanania NA. Long-term health-related quality-of-life and symptom response profiles with arformoterol in COPD: results from a 52-week trial. Int J Chron Obstruct Pulmon Dis. 2018 Feb 5;13:499-508.
Wilson MR, Patel JG, Coleman A, McDade CL, Stanford RH, Earnshaw SR. Cost-effectiveness analysis of umeclidinium/vilanterol for the management of patients with moderate to very severe COPD using an economic model. Int J Chron Obstruct Pulmon Dis. 2017 Mar 24;2017(12):997-1008.