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Immunogenicity of a low-dose diphtheria, tetanus and acellular pertussis combination vaccine with either inactivated or oral polio vaccine compared to standard-dose diphtheria, tetanus, acellular pertussis when used as a pre-school booster in UK children : a 5-year follow-up of a randomised controlled study
John, T..  Vaccine.  v. 33. no. 36.   2015-08-26. p. 4579 - 4585... issn: 0264-410X .   

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