RT Journal Article SR Electronic T1 Coumadin alone or aspirin plus coumadin reduced coronary events and death after acute myocardial infarction or unstable angina JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 16 OP 16 DO 10.1136/ebm.8.1.16 VO 8 IS 1 YR 2003 UL http://ebm.bmj.com/content/8/1/16.abstract AB