Global prevalence of injecting drug use and sociodemographic characteristics and prevalence of HIV, HBV, and HCV in people who inject drugs: a multistage systematic review by Louisa Degenhardt, ProfPhD, Amy Peacock, PhD, Samantha Colledge, BPsychSc[Hons], Janni Leung, PhD, Jason Grebely, PhD, Peter Vickerman, ProfPhD, Jack Stone, MMathStat, Evan B Cunningham, BSc[Hons], Adam Trickey, MSc, Kostyantyn Dumchev, MD, Michael Lynskey, ProfPhD, Paul Griffiths, MSc, Richard P Mattick, ProfPhD, Matthew Hickman, ProfPhD, Sarah Larney, PhD

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