设计：随机对照实验，多变量分析。
DESIGN: a randomized and controlled experiment, multiple variable analysis.
设计：多中心，随机对照实验。
Design: Multi central, randomized controlled experiment was designed.
设计：完全随机对照实验研究。
DESIGN: Completely randomized case-control study was adopted.
随机对照实验，单盲法评估。
DESIGN Randomized control experiment and single blind method.
设计：非随机对照实验研究。
因此，我们可以将随机对照实验排除在外。
设计：随机对照实验。
此研究已登记为国际标准随机对照实验，编号为ISRCTN38354748。
This study is registered as an International Standard Randomised Controlled Trial, number ISRCTN38354748.
此研究已登记为国际标准随机对照实验，编号为ISRCTN38354748。
This study is registered as an International Standard Randomised Controlled Trial, number ISRCTN38354748.
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