MATERIALS and METHODS: This was a randomized, double-blind, placebo controlled, parallel group, multicenter study.
材料和方法：这是一项随机、对照、双盲、平行分组、多中心的研究。
All the sub-studies were randomized, placebo-controlled, double-blind and had a parallel-group design.
所有研究均为随机、空白- 对照、双盲的平行设计试验。
All the sub-studies were randomized, placebo-controlled, double-blind and had a parallel-group design.
所有研究均为随机、空白- 对照、双盲的平行设计试验。
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