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Tiotropium versus salmeterol for the prevention of exacerbations of COPD.
Vogelmeier C, Hederer B, Glaab T, Schmidt H, Rutten-van Mölken MP, Beeh KM, Rabe KF, Fabbri LM; POET-COPD Investigators. Vogelmeier C, et al. N Engl J Med. 2011 Mar 24;364(12):1093-1103. doi: 10.1056/NEJMoa1008378. N Engl J Med. 2011. PMID: 21428765 Free article. Clinical Trial.