This randomized double blind study included 565 parturients.

565例产妇入选本双盲随机对照实验.

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This study is registered as an International Standard Randomised Controlled Trial , number ISRCTN 38354748.

此研究已登记为国际标准随机对照实验, 编号为ISRCTN38354748.

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The contrast and affix recovery test indicate that this method is accurate and reliable.

对照实验和添加回收实验表明,该法准确可靠.

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