RT Journal Article SR Electronic T1 Immediate carotid endarterectomy reduced non-perioperative stroke in severe asymptomatic carotid artery stenosis JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 145 OP 145 DO 10.1136/ebm.9.5.145 VO 9 IS 5 YR 2004 UL http://ebm.bmj.com/content/9/5/145.abstract AB