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Bull PC, Lowe BS, Kaleli N, Njuga F, Kortok M, Ross A, Ndungu F, Snow RW, Marsh K.Bull PC, et al. Among authors: marsh k.J Infect Dis. 2002 Jun 1;185(11):1688-91. doi: 10.1086/340420. Epub 2002 May 17.J Infect Dis. 2002.PMID: 12023781