Long-acting beta2-agonist in addition to tiotropium versus either tiotropium or long-acting beta2-agonist alone for chronic obstructive pulmonary disease

. Author manuscript; available in PMC: 2014 Sep 15.

Published in final edited form as: Cochrane Database Syst Rev. 2012 Apr 18;4:CD008989. doi: 10.1002/14651858.CD008989.pub2

Study	Reason for exclusion
Bateman 2001	No tiotropium plus long-acting beta₂-agonists combination treatment
Brusasco 2003	No tiotropium plus long-acting beta₂-agonists combination treatment
Di Marco 2003	No tiotropium plus long-acting beta₂-agonists combination treatment
Fujimoto 2007	8 weeks of treatment and no tiotropium plus long-acting beta₂-agonists combination treatment
Gross 2003	4 weeks of treatment, no tiotropium plus long-acting beta₂-agonists combination treatment, and crossover design
Jones 2010	crossover design
Meyer 2008	2 weeks of treatment, no tiotropium plus long-acting beta₂-agonists combination treatment, and crossover design
New 2009	6 weeks of treatment
ten Hacken 2007	6 weeks of treatment, no tiotropium plus long-acting beta₂-agonists combination treatment, and crossover design
van Noord 2003	6 weeks of treatment and crossover design
van Noord 2005	6 weeks of treatment and crossover design