Subjects: PREVENTION of sexually transmitted diseases; HIV prevention; HIV infection risk factorsCATALONIA (Spain); SPAIN
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Subjects: PREVENTION of sexually transmitted diseases; VIRAL disease prevention; SEXUALLY transmitted disease risk factorsMIDWEST (U.S.)
Subjects: EPIDEMIOLOGY of sexually transmitted diseases; MEDICAL protocols; PATIENT compliance
Subjects: HIV prevention; PSYCHOLOGY of Black people; CONFIDENCE intervalsGEORGIA
Subjects: PREVENTION of sexually transmitted diseases; HIV prevention; REINFORCEMENT (Psychology)ILLINOIS
Subjects: HIV infection risk factors; PREVENTION of sexually transmitted diseases; SYPHILIS epidemiologyVIETNAM; CHINA