2North American Symptomatic Carotid Endarterectomy Trial Collaborators. Benefical effect of carotidendartereetomy in symptomatic patients with high-grade carotid stenosis[J]. N Engl J Med, 1991,325(7) :445-453.
3Grant EG,BensonCB ,Moneta GL,et al. Carotid artery stenosis:grayscale and Doppler ultrasound diagnosis-Society of Radiolo- gists in Ultrasound consensus conference[J]. Ultrasound Q, 2003,19 (4) : 190-198.
