The North American Symptomatic Carotid Endarterectomy Trial, Surgical Results in 1415 Patients
Stroke 30:1751-1758,1745, Ferguson,G.G.,et al, 1999
Stroke and Mortality Rate in Carotid Endarterectomy:228 Consecutive Operations
Stroke 8:565-568, Easton,J.D.&Sherman,D.G., 1977