Echave M, Ojanguren ME, Elías I, De Andrés-Nogales F, Oyagüez I, Casado MÁ, Crespo C Cost-effectiveness of tiotropium in the treatment of patients with asthma 18th Annual European Congress International Society for Pharmacoeconomics & Outcomes Research (ISPOR). Milan, Italia. 7-11 nov 2015 POSTER