Street youths are the only high-risk group for HIV in a low-prevalence South American country., Lambert, Marie-Laurence, Torrico Faustino, Billot Claire, Mazina Deogratias, Boelaert Marleen, and Van der Stuyft Patrick , Sex Transm Dis, 2005 Apr, Volume 32, Issue 4, p.240-2, (2005)