title: 'Frontloading' or 'halfing' among injecting drug users in London.
authors.forename: G M
authors.initials: GM
authors.lastname: Hunter
authors.forename: M C
authors.initials: MC
authors.lastname: Donoghoe
mesh_terms: D004305:Dose-Response Relationship, Drug; D006679:HIV Seropositivity / Q000150:complications; D006304:Health Status; D006801:Humans; D008131:London / Q000453:epidemiology; D012309:Risk-Taking; D015819:Substance Abuse, Intravenous / Q000453:epidemiology*; D006113:United Kingdom / Q000453:epidemiology