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Imputing direct and indirect vaccine effectiveness of childhood pneumococcal conjugate vaccine against invasive disease by surveying temporal changes in nasopharyngeal pneumococcal colonization
Nzenze, Susan A..  American Journal of Epidemiology.  v. 186. no. 4.   2017-08-15. p. 435 - 444... issn: 0002-9262 .   

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