RT Journal Article SR Electronic T1 Aspirin improved outcome of acute stroke at 6 months but heparin did not JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 172 OP 172 DO 10.1136/ebm.1997.2.172 VO 2 IS 6 YR 1997 UL http://ebm.bmj.com/content/2/6/172.abstract AB