Study Design. A randomized controlled trial.

研究设计：随机对照试验。

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METHODS: a randomized controlled trial was adopted.

方法：采用随机对照试验。

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A randomized controlled trial of preventive antibiotics used for esophageal operations.

食管手术预防性抗生素使用的随机对照研究。

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The treatment was common until a randomized controlled trial proved it was actually harming women.

FORBES

The Cambridge group will begin a randomized controlled trial next month with 104 children involved, similar to the peanut study done already, but with controls, said researcher Dr. Andrew Clark of Cambridge University Hospitals.

CNN: 'Exciting' advance reported in peanut allergy therapy

Because the Framingham Heart Study is not a randomized controlled trial, it's still not clear if vitamin D is the real reason for the link (the vitamin's levels could drop in unhealthy people for other reasons), or if taking a supplement would lower the risk.

CNN: Vitamin D may be essential for heart health