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Lower blood flow velocity, higher resistance index, and larger diameter of extracranial carotid arteries are associated with ischemic stroke independently of carotid atherosclerosis and cardiovascular risk factors[J] . Chyi‐HueyBai,Jiunn‐RongChen,Hou‐ChangChiu,Wen‐HarnPan.J. Clin. Ultrasound . 2007 (6)