PT - JOURNAL ARTICLE ED - , TI - Review: β blockers differ in their efficacy for preventing major cardiovascular events in younger and older patients AID - 10.1136/ebm.11.6.168 DP - 2006 Dec 01 TA - Evidence Based Medicine PG - 168--168 VI - 11 IP - 6 4099 - http://ebm.bmj.com/content/11/6/168.short 4100 - http://ebm.bmj.com/content/11/6/168.full SO - Evid Based Med2006 Dec 01; 11