Subjects: HIV infection transmission; HIV prevention; HIV infection risk factorsBRAZIL; AUSTRALIA; THAILAND
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Subjects: HIV infection transmission; HIV infection risk factors; RISK-taking behavior
Subjects: DRUG administration; DRUG dosage; COCAINE
Subjects: HIV infection risk factors; HIV infection transmission; AGE distribution
Subjects: HIV infection risk factors; AGE distribution; ATTITUDE (Psychology)
Subjects: PREVENTION of infectious disease transmission; HIV prevention; HIV infection risk factorsUNITED States
Subjects: HIV prevention; HIV infection risk factors; EPIDEMIOLOGY of sexually transmitted diseasesSOUTH Africa
Subjects: HIV infection transmission; HIV prevention; HIV infection risk factorsONTARIO
Subjects: HIV prevention; HIV infection risk factors; RISK-taking behaviorBAHAMAS
Subjects: CIRCUMCISION; HIV prevention; HIV infection risk factorsZAMBIA