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Thomas ER, Shotton C, Weiss RA, Clapham PR, McKnight A.Thomas ER, et al. Among authors: weiss ra.AIDS. 2003 Feb 14;17(3):291-300. doi: 10.1097/00002030-200302140-00002.AIDS. 2003.PMID: 12556682
Clapham P, McKnight A, Simmons G, Weiss R.Clapham P, et al.Philos Trans R Soc Lond B Biol Sci. 1993 Oct 29;342(1299):67-73. doi: 10.1098/rstb.1993.0137.Philos Trans R Soc Lond B Biol Sci. 1993.PMID: 7904349Review.