title: Understanding the dynamics of sexual transmission of HIV among drug-using populations: an integration of biological, behavioral, and environmental perspectives.
authors.forename: Jacques L
authors.initials: JL
authors.lastname: Normand
authors.forename: Elizabeth Y
authors.initials: EY
authors.lastname: Lambert
authors.forename: David
authors.initials: D
authors.lastname: Vlahov
mesh_terms: D015658:HIV Infections / Q000635:transmission*; D006801:Humans; D012725:Sexual Behavior; D019966:Substance-Related Disorders / Q000150:complications*; D014481:United States; D014505:Urban Population