PT - JOURNAL ARTICLE AU - HART, ROBERT G TI - Warfarin in atrial fibrillation: underused in the elderly, often inappropriately used in the young AID - 10.1136/hrt.82.5.539 DP - 1999 Nov 01 TA - Heart PG - 539--540 VI - 82 IP - 5 4099 - http://heart.bmj.com/content/82/5/539.short 4100 - http://heart.bmj.com/content/82/5/539.full SO - Heart1999 Nov 01; 82