Targeting friendship groups increases teenage condom use to prevent HIV and other STDs.
D000293:Adolescent; D002648:Child; D017280:Condoms; D015658:HIV Infections / Q000517:prevention & control*; D006266:Health Education / Q000458:organization & administration*; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D010379:Peer Group; D012749:Sexually Transmitted Diseases / Q000517:prevention & control*