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Hazelzet JA, de Groot R, van Mierlo G, Joosten KF, van der Voort E, Eerenberg A, Suur MH, Hop WC, Hack CE.Hazelzet JA, et al.Infect Immun. 1998 Nov;66(11):5350-6. doi: 10.1128/IAI.66.11.5350-5356.1998.Infect Immun. 1998.PMID: 9784543Free PMC article.Clinical Trial.