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APA Citation
Dreher, M., Storre, J. H., Schmoor, C., & Windisch, W. (2010). high-intensity versus low-intensity non-invasive ventilation in patients with stable hypercapnic COPD: a randomised crossover trial. Thorax, 65(4), 303–308. http://access.bl.uk/ark:/81055/vdc_100135139743.0x000022