Design of a randomized controlled trial within a comprehensive prognostic cohort study.
设计随机对照试验在一个全面的预后的队列研究。
DESIGN Randomized, single blind and placebo control prospective study based on patients.
设计以患者为研究对象，随机，盲，慰剂对照的前瞻性研究。
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。
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