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doi.org/10.1034/j.1399-3003.2000.15e11.x, hdl.handle.net/1765/70523
The European Respiratory Journal
Erasmus MC: University Medical Center Rotterdam

van Noord, J., de Munck, D. R. A. J., Bantje, T., Hop, W., Akveld, H.& Bommer, A. (2000). Long-term treatment of chronic obstructive pulmonary disease with salmeterol and the additive effect of ipratropium. The European Respiratory Journal, 15(5), 878–885.https://doi.org/10.1034/j.1399-3003.2000.15e11.x