PT - JOURNAL ARTICLE ED - , TI - Warfarin reduced major stroke more than aspirin in elderly patients with atrial fibrillation in primary care. AID - 10.1136/ebm.12.6.172 DP - 2007 Dec 01 TA - Evidence Based Medicine PG - 172--172 VI - 12 IP - 6 4099 - http://ebm.bmj.com/content/12/6/172.short 4100 - http://ebm.bmj.com/content/12/6/172.full SO - Evid Based Med2007 Dec 01; 12