AIDS conference in Amsterdam: prevalence of social problems and a possible third virus.
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000382:microbiology; D000349:Africa / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D006801:Humans; D009426:Netherlands; D012940:Social Problems; D012959:Socioeconomic Factors