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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.A, de Munck, D.R.A.J, Bantje, Th.A, Hop, W.C.J, Akveld, J.E.M, & 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. doi:10.1034/j.1399-3003.2000.15e11.x