Tailoring an HIV-prevention intervention for cocaine injectors and crack users in Porto Alegre, Brazil. - Leukefeld, C. G.; Pechansky, F.; Martin, S. S.; Surratt, H. L.; Inciardi, J. A.; Kessler, F. H. P.; Orsi, M. M.; Von Diemen, L.; Da Silva, E. Meyer (AIDS Care, 2005)