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。
SAS has over 30 years of developing and delivering advanced statistical analysis software.
SAS公司已经超过30年，开发并提供先进的统计分析软件岁。
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