Original Research

Comorbidities of patients in tiotropium clinical trials: comparison with observational studies of patients with chronic obstructive pulmonary disease

Miravitlles M, Price D, Rabe KF, Schmidt H, Metzdorf N, Celli B

International Journal of Chronic Obstructive Pulmonary Disease 2015, 10:549-564

Published Date: 16 March 2015