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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”

VaccinationPreventive MedicineHealth PolicyHealth CommunicationYoung Heroin UsersPoor ValidityVaccine EfficacySelf-reported Hbv VaccinationPublic HealthPublic Health PolicyMedicineVaccine HesitancyPublic Health Intervention