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. Author manuscript; available in PMC: 2014 Sep 22.
Published in final edited form as: Cochrane Database Syst Rev. 2011 Sep 7;(9):CD009039. doi: 10.1002/14651858.CD009039.pub2
Study Reason for exclusion
Golabi 2006 Four weeks of treatment, only tiotropium alone and salmeterol/fluticasone treatment groups, cross-over design
Hara 2007 Eight weeks of treatment, only tiotropium alone and salmeterol/fluticasone treatment groups, cross-over design
Mittmann 2010 No tiotropium plus LABA treatment group
Singh 2008 Two weeks of treatment, no tiotropium plus LABA treatment group, and of cross-over design