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Kaplan, A. Effects of tiotropium combined with either salmeterol or salmeterol/fluticasone in moderate to severe COPD. Prim Care Respir J 16, 258–260 (2007). https://doi.org/10.3132/pcrj.2007.00055
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DOI: https://doi.org/10.3132/pcrj.2007.00055