Vertebrobasilar Disease
NEJM 352:2618-2626, Savitz,S.I.&Caplan,L.R., 2005
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Neurol 38:68-75, Darby,D.G.,et al, 1988
Basilar Artery Stenosis:Middle & Distal Segments
Neurol 37:1742-1746, Pessin,M.S.,et al, 1987