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\bibitem{HealthProtectionAgency_etal2003} Health Protection Agency, Scottish Centre for Infection and Environmental Health, National Public Health Service for Wales, Communicable Disease Surveillance Centre Northern Ireland, Centre for Research on Drugs and Health Behaviour, \& Unlinked Anonymous Surveys Steering Group. (2003). \textit{Shooting up : infections among injecting drug users in the United Kingdom 2002}. London: Health Protection Agency (HPA).

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