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3. A simple spectral parameter for accurate classification of severe carotid artery disease;Roederer;Bruit,1989
4. Correlation of North American Symptomatic Carotid Endarterectomy Trial (NASCET): Angiographic definition of 70% to 90% internal carotid artery stenosis with duplex scanning;Moneta;J Vasc Surg,1993