Inclusion criteria |
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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 |