1. Tiotropium is superior to salmeterol in reducing frequency of exacerbations: but the effect of adding tiotropium to the combination of inhaled corticosteroid and long-acting β(2)-agonist remains unclear. Issue 3 (22nd November 2011) Authors: Hodder, Rick Journal: Evidence-based medicine Issue: Volume 17:Issue 3(2012) Page Start: 93 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗