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: HIV infection risk factors; SEXUALLY transmitted disease risk factors; EPIDEMIOLOGY of sexually transmitted diseasesUNITED States
Subjects: HIV infection risk factors; PREVENTION of sexually transmitted diseases; SYPHILIS epidemiologyVIETNAM; CHINA
Subjects: PREVENTION of sexually transmitted diseases; SEXUALLY transmitted disease risk factors; HIV infectionsCAMEROON
Subjects: SEXUALLY transmitted disease risk factors; HIV-positive persons; COMMUNICABLE diseasesGERMANY
Subjects: HIV prevention; HIV infection risk factors; EPIDEMIOLOGY of sexually transmitted diseasesSOUTH Africa
Subjects: HIV infection risk factors; SUBSTANCE abuse risk factors; SEXUALLY transmitted disease risk factorsFLORIDA
Subjects: PREVENTION of sexually transmitted diseases; HEPATITIS C prevention; SUBSTANCE abuse prevention
Subjects: PREMARITAL sex; COLLEGE students; SEXUALLY transmitted disease risk factors