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APA Citation
Man, W. D. C., Mustfa, N., Nikoletou, D., Kaul, S., Hart, N., Rafferty, G. F., Donaldson, N., Polkey, M. I., & Moxham, J. (2004). effect of salmeterol on respiratory muscle activity during exercise in poorly reversible COPD. Thorax, 59(6), 471–476. http://access.bl.uk/ark:/81055/vdc_100137791560.0x00002f