PT - JOURNAL ARTICLE ED - , TI - Review: primary prevention strategies do not improve contraceptive use or reduce pregnancies in adolescents AID - 10.1136/ebm.8.1.18 DP - 2003 Jan 01 TA - Evidence Based Medicine PG - 18--18 VI - 8 IP - 1 4099 - http://ebm.bmj.com/content/8/1/18.short 4100 - http://ebm.bmj.com/content/8/1/18.full SO - Evid Based Med2003 Jan 01; 8