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Watkins WM, Brandling-Bennett AD, Nevill CG, Carter JY, Boriga DA, Howells RE, Koech DK.Watkins WM, et al. Among authors: howells re.Trans R Soc Trop Med Hyg. 1988;82(3):398-403. doi: 10.1016/0035-9203(88)90133-2.Trans R Soc Trop Med Hyg. 1988.PMID: 3068855Clinical Trial.
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Ndifor AM, Howells RE, Ward SA.Ndifor AM, et al. Among authors: howells re.Trans R Soc Trop Med Hyg. 1992 May-Jun;86(3):229-30. doi: 10.1016/0035-9203(92)90284-j.Trans R Soc Trop Med Hyg. 1992.PMID: 1412637
Gershon P, Howells RE.Gershon P, et al. Among authors: howells re.Trans R Soc Trop Med Hyg. 1986;80(5):753-7. doi: 10.1016/0035-9203(86)90376-7.Trans R Soc Trop Med Hyg. 1986.PMID: 3299891
Boulter MK, Bray PG, Howells RE, Ward SA.Boulter MK, et al. Among authors: howells re.Trans R Soc Trop Med Hyg. 1993 May-Jun;87(3):303. doi: 10.1016/0035-9203(93)90137-f.Trans R Soc Trop Med Hyg. 1993.PMID: 8236399No abstract available.
Bafort JM, Howells RE.Bafort JM, et al. Among authors: howells re.Trans R Soc Trop Med Hyg. 1970;64(4):467. doi: 10.1016/0035-9203(70)90037-4.Trans R Soc Trop Med Hyg. 1970.PMID: 5485598No abstract available.