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APA Citation
Armstrong, B. G., Mangtani, P., Fletcher, A., Kovats, S., McMichael, A., Pattenden, S., & Wilkinson, P. (2004). effect of influenza vaccination on excess deaths occurring during periods of high circulation of influenza: cohort study in elderly people. BMJ, 329(7467), 660–. http://access.bl.uk/ark:/81055/vdc_100177573021.0x00002a