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APA Citation
Yu, T., Fain, K., Boyd, C. M., Singh, S., Weiss, C. O., Li, T., Varadhan, R., & Puhan, M. A. (2014). benefits and harms of roflumilast in moderate to severe COPD. Thorax, 69(7), 616–622. http://access.bl.uk/ark:/81055/vdc_100135180280.0x00002c