Study designs of evaluations included in the review
Published reports of HIV seroprevalence surveys which included 50 or more drug users; reports and other sources of information about implementation of needle exchange programmes (NEPs) in corresponding cities.
Specific interventions included in the review
Provision of needle exchange programmes.
Participants included in the review
Cities throughout the world.
Outcomes assessed in the review
HIV seroprevalence was assessed.
How were decisions on the relevance of primary studies made?
The authors do not state how the papers were selected for the review, or how many of the authors performed the selection.