Amad H, Yan AT, Yan RT, Huynh T, Gore JM, Montalescot G, DeYoung JP, Gallo R, Rose B, Steg PG, Goodman SG. The association between prior use of aspirin and/or warfarin and the in-hospital management and outcomes in patients presenting with acute coronary syndromes: insights from the Global Registry of Acute Coronary Events (GRACE). Can J Cardiol. 2012 Jan-Feb; 28(1):48-53.