Benefit of carotid endarterectomy in patients with symptomatic moderate or severe stenosis. - Barnett,J.M.; Taylor,D.W.; Eliasziw,M.; Fox,A.J.; Ferguson,G.G.; Haynes,R.B.; Rankin,R.N.; Clagett,G.P.; Hachinski,V.C.; Sackett,D.L.; Thorpe,K.E. (N Engl J Med, 1998)