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Elhassan IM, Satti GH, Ali AE, Fadul I, Elkhalifa AA, Abedelrahim AM, Ming C, Theander TG.Elhassan IM, et al.Trans R Soc Trop Med Hyg. 1993 Nov-Dec;87(6):685-6. doi: 10.1016/0035-9203(93)90293-y.Trans R Soc Trop Med Hyg. 1993.PMID: 8296377Clinical Trial.