title: Focal networks and HIV risk among African-American male intravenous drug users.
authors: Department of Political Science, University of Pennsylvania, Philadelphia 19104, USA.
authors: F W
authors: FW
authors: Frey
authors: E
authors: E
authors: Abrutyn
authors: D S
authors: DS
authors: Metzger
authors: G E
authors: GE
authors: Woody
authors: C P
authors: CP
authors: O'Brien
authors: P
authors: P
authors: Trusiani
mesh_terms: D000328:Adult; D001741:Black or African American / Q000523:psychology; D015658:HIV Infections / Q000191:economics / Q000453:epidemiology / Q000523:psychology*; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D015143:Philadelphia / Q000453:epidemiology; D012309:Risk-Taking; D012725:Sexual Behavior; D012944:Social Support; D015819:Substance Abuse, Intravenous / Q000191:economics / Q000453:epidemiology / Q000523:psychology*