Methods: a multicenter, randomized, double blind, and placebo controlled clinical study was performed.
方法本次为一中心，随机，双盲，安慰剂对照临床观察。
Methods the data from a multicenter study on a puncture system was used. The assessing of agreement was done by using clinical assessing methods and the process capability index.
方法采用某多中心研究评价引导穿刺仪穿刺效果的临床试验数据，采用现有的临床评价手段和过程能力指数分别评价实际操作结果与预计值之间的一致性。
Methods the data from a multicenter study on a puncture system was used. The assessing of agreement was done by using clinical assessing methods and the process capability index.
方法采用某多中心研究评价引导穿刺仪穿刺效果的临床试验数据，采用现有的临床评价手段和过程能力指数分别评价实际操作结果与预计值之间的一致性。
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