Methods(It was) a randomized, single-blind, parallel controlled and multiple center trial design.
方法采用随机单盲平行对照多中心试验方法。
Design: Randomized, controlled, single blind trial design.
设计：随机对照单盲的实验研究。
METHODS: a randomized, multi center, paralleled, single blind, controlled trial was designed.
方法：随机、单盲、多中心、平行对照设计。
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