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APA Citation
Dahl, R., Chung, K. F., Buhl, R., Magnussen, H., Nonikov, V., Jack, D., Bleasdale, P., Owen, R., Higgins, M., & Kramer, B. (2010). efficacy of a new once-daily long-acting inhaled β2-agonist indacaterol versus twice-daily formoterol in COPD. Thorax, 65(6), 473–479. http://access.bl.uk/ark:/81055/vdc_100136586049.0x000029