title: HIV risk in adolescents: the role of sexual activity and substance use behaviors.
authors: Department of Pediatrics, University of California, San Francisco 94143-0374, USA.
authors: C B
authors: CB
authors: Boyer
authors: J M
authors: JM
authors: Ellen
mesh_terms: D000293:Adolescent; D005260:Female; D015658:HIV Infections / Q000453:epidemiology / Q000523:psychology* / Q000635:transmission; D006801:Humans; D008297:Male; D012309:Risk-Taking; D012725:Sexual Behavior; D012919:Social Behavior; D019966:Substance-Related Disorders / Q000453:epidemiology / Q000523:psychology*; D014481:United States / Q000453:epidemiology