Heterosexual transmission of HIV.
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P Piot | P. Piot | H. Taelman | F. Plummer | E. Ngugi | J. Kreiss | E N Ngugi | F A Plummer | J K Kreiss | D. Cameron | J N Simonsen | J O Ndinya-Achola | D W Cameron | H Taelman | J. Simonsen | J. Ndinya-Achola