Original Research

Tiotropium reduces risk of exacerbations irrespective of previous use of inhaled anticholinergics in placebo-controlled clinical trials

Cooper CB, Anzueto A, Decramer M, Celli B, Tashkin DP, Leimer I, Kesten S

International Journal of Chronic Obstructive Pulmonary Disease 2011, 6:269-275

Published Date: 9 May 2011