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doi.org/10.1183/09031936.02.00237402, hdl.handle.net/1765/70404
The European Respiratory Journal
Erasmus MC: University Medical Center Rotterdam

Lötters, F., van Tol, B., Kwakkel, G., & Gosselink, R. (2002). Effects of controlled inspiratory muscle training in patients with COPD: A meta-analysis. The European Respiratory Journal, 20(3), 570–576. doi:10.1183/09031936.02.00237402