DESIGN: a randomized single blind controlled observation.
设计:随机单盲对照观察。
Design: Randomized, controlled, single blind trial design.
设计:随机对照单盲的实验研究。
DESIGN Randomized control experiment and single blind method.
随机对照实验,单盲法评估。
DESIGN:A randomized controlled single blind study.
设计:采用随机对照单盲实验研究。
DESIGN:A randomized controlled single blind study.
设计:采用随机对照单盲实验研究。
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