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Friis H, Kaestel P, Nielsen N, Simonsen PE.Friis H, et al.Trans R Soc Trop Med Hyg. 2002 Mar-Apr;96(2):151-6. doi: 10.1016/s0035-9203(02)90287-7.Trans R Soc Trop Med Hyg. 2002.PMID: 12055804
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Olsen A, Thiong'o FW, Ouma JH, Mwaniki D, Magnussen P, Michaelsen KF, Friis H, Geissler PW.Olsen A, et al. Among authors: friis h.Trans R Soc Trop Med Hyg. 2003 Jan-Feb;97(1):109-14. doi: 10.1016/s0035-9203(03)90042-3.Trans R Soc Trop Med Hyg. 2003.PMID: 12886816Clinical Trial.