Subjects: PREVENTION of sexually transmitted diseases; HIV prevention; HEALTH services accessibilityMASSACHUSETTS
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Subjects: HIV prevention; HIV infection risk factors; RISK-taking behaviorFLORIDA; MASSACHUSETTS
Subjects: STATISTICS; SEXUAL orientation; HEALTH services accessibilityMASSACHUSETTS
Subjects: STATISTICS; CHILD sexual abuse; CONFIDENCE intervals
Subjects: HIV infection risk factors; CROSS-sectional method; AGE distribution