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APA Citation
Crowcroft, N. S., Booy, R., Harrison, T., Spicer, L., Britto, J., Mok, Q., Heath, P., Murdoch, I., Zambon, M., George, R., & Miller, E. (2003). severe and unrecognised: pertussis in UK infants. Archives of disease in childhood, 88(9), 802–806. http://access.bl.uk/ark:/81055/vdc_100137793100.0x00005e