From the Centers for Disease Control and Prevention. Trends in HIV-related sexual risk behaviors among high school students--selected US cities, 1991-1997.
D000293:Adolescent; D005260:Female; D015658:HIV Infections / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission; D006801:Humans; D008297:Male; D011159:Population Surveillance; D012309:Risk-Taking; D012574:Schools; D012725:Sexual Behavior / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology; D014505:Urban Population