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APA Citation
Schmidt, H., Kögler, H., Geier, S., Glaab, T., & Leimer, I. (n.d.). p249 Effect Size Of Open-label Versus Double-blind Administration Of Tiotropium In Trials Investigating Health-related Quality Of Life In Copd. Thorax, 69, A186. http://access.bl.uk/ark:/81055/vdc_100135144060.0x000029