Poor validity of self-reported HBV vaccination among young heroin users in Spain supports the policy "don't ask, draw a blood sample, vaccinate and try to schedule another visit"

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