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APA Citation
Schembri, S., Morant, S., Winter, J. H., & MacDonald, T. M. (2009). influenza but not pneumococcal vaccination protects against all-cause mortality in patients with COPD. Thorax, 64(7), 567–572. http://access.bl.uk/ark:/81055/vdc_100136585407.0x00002b