Incidence of HIV and HCV in people who inject drugs: a systematic and meta-analysis review protocol.

1 Although epidemiological evidence indicates a decreasing trend in many developed countries during the last few years, HIV prevalence is increasing in developing countries. 2 The UNAIDS global strategy for 2016–2021 focuses on the application of effective interventions to reduce the burden of HIV among key populations. 3 One of the main at-risk populations for HIV infection are people who inject drugs (PWIDs).

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