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. 2008 Jul 29;37(6):1255–1265. doi: 10.1093/ije/dyn151

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Published by Oxford University Press on behalf of the International Epidemiological Association © The Author 2008; all rights reserved.

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Flowchart summarizing the results of the search on HIV-1 transmission probabilities relating to orogenital sex up to July 2007. ‘Studies’ may refer to published articles or abstracts. ^aCounting principal estimate by del Romero et al. 2002 only (and not subdivisions by direction of transmission and type of act). ^bCounting only the estimate by Balls et al. 2004 and Page-Shafer et al. 2002 restricted to participants reporting exposure to a seropositive partner or partner of unknown serostatus

	
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