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Ofulla AV, Okoye VC, Khan B, Githure JI, Roberts CR, Johnson AJ, Martin SK.Ofulla AV, et al. Among authors: roberts cr.Am J Trop Med Hyg. 1993 Sep;49(3):335-40. doi: 10.4269/ajtmh.1993.49.335.Am J Trop Med Hyg. 1993.PMID: 8396859
Ogwan'g RA, Mwangi JK, Githure J, Were JB, Roberts CR, Martin SK.Ogwan'g RA, et al. Among authors: roberts cr.Am J Trop Med Hyg. 1993 Jul;49(1):25-9. doi: 10.4269/ajtmh.1993.49.25.Am J Trop Med Hyg. 1993.PMID: 8352388
Mebrahtu Y, Lawyer P, Githure J, Were JB, Muigai R, Hendricks L, Leeuwenburg J, Koech D, Roberts C.Mebrahtu Y, et al.Am J Trop Med Hyg. 1989 Sep;41(3):289-94. doi: 10.4269/ajtmh.1989.41.289.Am J Trop Med Hyg. 1989.PMID: 2552850
Lawyer PG, Ngumbi PM, Anjili CO, Odongo SO, Mebrahtu YB, Githure JI, Koech DK, Roberts CR.Lawyer PG, et al. Among authors: roberts cr.Am J Trop Med Hyg. 1990 Jul;43(1):31-43. doi: 10.4269/ajtmh.1990.43.31.Am J Trop Med Hyg. 1990.PMID: 2382763
Johnson RN, Lawyer PG, Ngumbi PM, Mebrahtu YB, Mwanyumba JP, Mosonik NC, Makasa SJ, Githure JI, Roberts CR.Johnson RN, et al. Among authors: roberts cr.Am J Trop Med Hyg. 1999 May;60(5):854-8. doi: 10.4269/ajtmh.1999.60.854.Am J Trop Med Hyg. 1999.PMID: 10344664
Ogwan'g R, Mwangi J, Gachihi G, Nwachukwu A, Roberts CR, Martin SK.Ogwan'g R, et al. Among authors: roberts cr.Biochem Pharmacol. 1993 Nov 2;46(9):1601-6. doi: 10.1016/0006-2952(93)90329-u.Biochem Pharmacol. 1993.PMID: 8240417