New York City prisons.
D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D015528:HIV Seroprevalence; D015497:HIV-1; D006556:Heroin Dependence / Q000150:complications* / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D009519:New York City / Q000453:epidemiology; D015819:Substance Abuse, Intravenous / Q000150:complications* / Q000453:epidemiology