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Tudor-Williams, G., Frankland, J., Isaacs, D., Mayon-White, R. T., MacFarlane, J. A., Slack, M. P., Anderson, E., Rees, D. G., & Moxon, E. R. (1989). haemophilus influenzae type b disease in the Oxford region.. Archives of disease in childhood, 64(4), 517–519. http://access.bl.uk/ark:/81055/vdc_100135417335.0x000056