椎动脉起始段狭窄70%~99%致远段收缩期切迹频谱改变的观察
추동맥기시단협착70%~99%치원단수축기절적빈보개변적관찰
Observation of Proximal Vertebral Artery Stenosis 70% ~ 99% Leading to Systolic Cut Trace Changes
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