Injecting and HIV prevalence among young heroin users in three Spanish cities and their association with the delayed implementation of harm reduction programmes

1. De La Fuente, L.
2. Bravo, M.J.
3. Toro, C.
4. Brugal, M.T.
5. Barrio, G.
6. Soriano, V.
7. Vallejo, F.
8. Ballesta, R.