title: Toward comprehensive studies of HIV in intravenous drug users: issues in treatment-based and street-based samples.
authors.affiliation: Department of Epidemiology and Biostatistics, School of Medicine, University of California, San Francisco.
authors.forename: J K
authors.initials: JK
authors.lastname: Watters
authors.forename: Y T
authors.initials: YT
authors.lastname: Cheng
mesh_terms: D000328:Adult; D005260:Female; D015658:HIV Infections / Q000097:blood / Q000453:epidemiology* / Q000276:immunology; D006716:Homosexuality; D006801:Humans; D008297:Male; D016485:Needle Sharing / Q000706:statistics & numerical data; D044469:Racial Groups; D012494:Sampling Studies; D012725:Sexual Behavior; D015819:Substance Abuse, Intravenous / Q000453:epidemiology* / Q000628:therapy; D014481:United States