Sampling issues for natural history studies including intravenous drug abusers.
Wiebel
W W
WW
AIDS Outreach Intervention Program, School of Public Health, University of Illinois, Chicago 60612.
D015658:HIV Infections / Q000453:epidemiology*; D006801:Humans; D012107:Research Design; D012494:Sampling Studies; D015819:Substance Abuse, Intravenous / Q000453:epidemiology*; D014481:United States