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Reduction of exacerbations by the PDE4 inhibitor roflumilast - the importance of defining different subsets of patients with COPD

Stephen I Rennard*, Peter MA Calverley, Udo M Goehring, Dirk Bredenbröker and Fernando J Martinez

Respiratory Research 2011, 12:18 doi:10.1186/1465-9921-12-18

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