A prospective cohort study of risk behaviours, retention and loss to follow-up over 5 years among women and men in a needle exchange program in Stockholm, Sweden

•Injection and sexual risk behaviours varied between women and men subgroups.•Intimate relationships display high-risk behaviours, linked to HIV and HCV-infection.•Women were more likely than men to remain in the needle exchange program over time.•Determinants associated with being lost to follow-up...

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