Subjects: PREVENTION of sexually transmitted diseases; HIV prevention; HIV infection risk factorsCATALONIA (Spain); SPAIN
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Subjects: HIV prevention; HIV infection risk factors; RISK-taking behaviorFLORIDA; MASSACHUSETTS
Subjects: HIV infection risk factors; HIV prevention; SEXUALLY transmitted diseasesUNITED States
Subjects: TRANSACTIONAL sex; MEN who have sex with men; SEXUAL healthUNITED Kingdom
Subjects: HIV infection risk factors; DIAGNOSIS of HIV infections; HIV infection epidemiologySCOTLAND
Subjects: HIV infection risk factors; PSYCHIATRIC epidemiology; DIAGNOSIS of HIV infectionsUNITED States
Subjects: HIV infection risk factors; HIV infection transmission; HIV preventionMEXICO; CALIFORNIA
Subjects: HIV infection risk factors; RISK assessment; SELF-evaluationAFRICA
Subjects: DIAGNOSIS of HIV infections; HIV infection risk factors; HIV infection transmissionNIGERIA
Subjects: HIV infection risk factors; SEXUALLY transmitted disease risk factors; EPIDEMIOLOGY of sexually transmitted diseasesUNITED States