Tiotropium versus Salmeterol for the Prevention of Exacerbations of COPD.
Vogelmeier, Claus; Hederer, Bettina; Glaab, Thomas; Schmidt, Hendrik; Mölken, Maureen P.M.H. Rutten-van; Beeh, Kai M.; Rabe, Klaus F.; Fabbri, Leonardo M.; New England Journal of Medicine, 2011, vol. 364, issue 12, p 1093, ISSN 00284793. ISBN 00284793.

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