So, we can rule out a randomized controlled experiment.
因此，我们可以将随机对照实验排除在外。
Design: Multi central, randomized controlled experiment was designed.
设计：多中心，随机对照实验。
Design: Complete randomized group design, controlled experiment.
设计：完全随机分组设计，对照实验。
Design: Randomized controlled single experiment was designed.
设计：随机对照单一实验。
DESIGN: a randomized and controlled experiment, multiple variable analysis.
设计：随机对照实验，多变量分析。
DESIGN: a randomized and controlled experiment, multiple variable analysis.
设计：随机对照实验，多变量分析。
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