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。
We can't know for sure because this is not a controlled experiment.
我们不能确定，因为这不是一个可控实验。
Design: Complete randomized group design, controlled experiment.
设计：完全随机分组设计，对照实验。
The controlled experiment has proved that the result is relatively stable.
通过控制试验，证明结果较稳定。
DESIGN: a randomized and controlled experiment, multiple variable analysis.
设计：随机对照实验，多变量分析。
DESIGN: a controlled experiment was conducted on the basis of clinical diagnosis.
设计：以诊断为依据设立对照的实验研究。
DESIGN: a controlled experiment was conducted on the basis of clinical diagnosis.
设计：以诊断为依据设立对照的实验研究。
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