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Nelson, Paul K. and Mathers, Bradley M and Cowie, Benjamin and Hagan, Holly and Des Jarlais, Don C and Horyniak, Danielle and Degenhardt, Louisa (2011) Global epidemiology of hepatitis B and hepatitis C in people who inject drugs: results of systematic reviews. The Lancet , 378 , (9791) , pp. 571-583.