Additional file 2: of Needle exchange programs for the prevention of hepatitis C virus infection in people who inject drugs: a systematic review with meta-analysis DavisStephen DailyShay KristjanssonAlfgeir KelleyGeorge ZulligKeith BausAdam DavidovDanielle FisherMelanie 2017 Screening list and codebook. This spreadsheet contains the reasons for inclusion and exclusion for all screened abstracts and articles, and the codebook for included articles. (XLSX 147 kb)