BARRIO, G., De La FUENTE, L., TORO, C., BRUGAL, T., SORIANO, V., GONZALEZ, F., . . . SILVA, T. (2007). Prevalence of HIV infection among young adult injecting and non-injecting heroin users in Spain in the era of harm reduction programmes: Gender differences and other related factors. Cambridge University Press.

BARRIO, G., L. De La FUENTE, C. TORO, T. M BRUGAL, V. SORIANO, F. GONZALEZ, M. J BRAVO, F. VALLEJO, and T. C SILVA. Prevalence of HIV Infection Among Young Adult Injecting and Non-injecting Heroin Users in Spain in the Era of Harm Reduction Programmes: Gender Differences and Other Related Factors. Cambridge University Press, 2007.

BARRIO, G., et al. Prevalence of HIV Infection Among Young Adult Injecting and Non-injecting Heroin Users in Spain in the Era of Harm Reduction Programmes: Gender Differences and Other Related Factors. Cambridge University Press, 2007.