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APA Citation
Singh, D., Gaga, M., Schmidt, O., Bjermer, L., Grönke, L., Voß, F., & Ferguson, G. (2016). effects of tiotropium + olodaterol versus tiotropium or placebo by COPD disease severity and previous treatment history in the OTEMTO® studies. Respiratory research, 17(1), 1–13. http://access.bl.uk/ark:/81055/vdc_100080465067.0x000123