We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleMeta-analysis: anticholinergics, but not beta-agonists, reduce severe exacerbations and respiratory mortality in COPD.AuthorsSalpeter SR; Buckley NS; Salpeter EEPublicationJournal of general internal medicine, 2006, Vol 21, Issue 10, p1011ISSN1525-1497Publication typearticleDOI10.1111/j.1525-1497.2006.00507.x