DESIGN: a completely randomized, double blind controlled trial was conducted.
设计：完全随机双盲实验对照研究。
DESIGN: Randomized and double blind observation.
设计：随机双盲法观察。
DESIGN: Randomly double blind and control experiment.
设计：随机双盲对照实验。
METHODS: The trial design was randomized, double blind, double modeling and multiple center.
方法：采用随机、对照、双盲、双模拟、多中心试验设计方法。
DESIGN: Double blind, randomized controlled study.
设计：本研究采用双盲、随机、对照方法。
DESIGN: Double blind, randomized controlled study.
设计：本研究采用双盲、随机、对照方法。
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