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Table 1 Inclusion criteria applied to selected articles

From: Prevalence of HIV and HCV among injecting drug users in three selected WHO-EMRO countries: a meta-analysis

Inclusion criteria

The study reported on the prevalence of HIV and/or HCV

The sample was injecting drug users

Samples were tested for antibodies to HIV and HCV by enzyme-linked immunosorbent assay

The study that was published in English or Persian

The study that was conducted in either Afghanistan, Pakistan, or Iran

The study was an empirical study published in a peer-review journal

The study was published from 2003 up to 2018