Immunogenicity of combined diphtheria, tetanus, and pertussis vaccine given at 2, 3, and 4 months versus 3, 5, and 9 months of age by Booy, R., Taylor, S., Tudor-Williams, G., Moxon, E.R., Aitken, S.J.M., Griffiths, H., Chapel, H.M., Ashworth, L.A.E., Macfarlane, J.A., Mayon-White, R.T.

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