Method: 1000 healthy person's both side of vertebral arteries were measured by Doppler ultrasonographic instrument and the result of it was calculated with SAS statistical analysis software.
方法：应用超声多普勒诊断仪检测1000例健康人双侧椎动脉，用SAS统计分析软件计算。
Method: 1000 healthy person's both side of vertebral arteries were measured by Doppler ultrasonographic instrument and the result of it was calculated with SAS statistical analysis software.
方法：应用超声多普勒诊断仪检测1000例健康人双侧椎动脉，用SAS统计分析软件计算。
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