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APA Citation
Weatherall, M., Wijesinghe, M., Perrin, K., Harwood, M., & Beasley, R. (2010). meta-analysis of the risk of mortality with salmeterol and the effect of concomitant inhaled corticosteroid therapy. Thorax, 65(1), 39–43. http://access.bl.uk/ark:/81055/vdc_100135162490.0x000028