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Study design considerations in a large COPD trial comparing effects of tiotropium with salmeterol on exacerbations

Kai-Michael Beeh1, Bettina Hederer, Thomas Glaab

  • 1insaf-Respiratory Research Institute, Wiesbaden, Germany.

International Journal of Chronic Obstructive Pulmonary Disease
|May 14, 2009
PubMed

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