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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
衰老所致改变可能会诱发高血压,但具体原因不明(原发性高血压)。随着年龄的增长,大动脉逐渐变得僵硬,小动脉部分狭窄。一些专家认为这种血管的僵硬及小动脉的狭窄可以部分解释血压随着年龄的增长而增高。