This study is registered with the International Standard Randomised Trial number 34123170.

这项研究注册记录为国际标准随机对照试验,(注册)号为34123170.

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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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