title: Multimethod research from targeted sampling to HIV risk environments.
authors.affiliation: Department of Family and Community, University of California-San Francisco 94143-1304, USA.
authors.forename: R N
authors.initials: RN
authors.lastname: Bluthenthal
authors.forename: J K
authors.initials: JK
authors.lastname: Watters
mesh_terms: D002140:California / Q000453:epidemiology; D004812:Epidemiologic Methods; D015658:HIV Infections / Q000453:epidemiology / Q000523:psychology / Q000635:transmission*; D006801:Humans; D012107:Research Design; D012307:Risk Factors; D012309:Risk-Taking; D012931:Social Environment; D015819:Substance Abuse, Intravenous / Q000523:psychology