Benefit of carotid endarterectomy in patients with symptomatic moderate or severe stenosis. North American Symptomatic Carotid Endarterectomy Trial Collaborators - Barnett, HJ; Taylor, DW; Eliasziw, M; Fox, AJ; Ferguson, GG; Haynes, RB; Rankin, RN; Clagett, GP; Hachinski, VC; Sackett, DL; Thorpe, KE; Meldrum, HE; Spence, JD (N Engl J Med, 1998)