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APA Citation
Mitchell, R., Trück, J., & Pollard, A. J. (n.d.). use of the 13-valent pneumococcal conjugate vaccine in children and adolescents aged 6 – 17 years. Expert opinion on biological therapy, 13, 1451–1465. http://access.bl.uk/ark:/81055/vdc_100042460756.0x000001