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HIV Infections
Substance-Related Disorders
Schools
Adolescent Behavior
Pregnancy in Adolescence
Sexual Behavior
Health Knowledge, Attitudes, Practice
Male Homosexuality
Program Evaluation
Interpersonal Relations
England
Great Britain
Longitudinal Studies
Risk Factors
Randomized Controlled Trials
Health Promotion
Peer Group
Sex Education
Public Health
Pregnancy
Co-Publications
13
8
7
6
5
4
3
2
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