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APA Citation
Dabrera, G., Amirthalingam, G., Andrews, N., Campbell, H., Ribeiro, S., Kara, E., Fry, N. K., & Ramsay, M. (n.d.). a Case-Control Study to Estimate the Effectiveness of Maternal Pertussis Vaccination in Protecting Newborn Infants in England and Wales, 2012–2013. Clinical infectious diseases, 60, 333–337. http://access.bl.uk/ark:/81055/vdc_100151521833.0x000049