Randomised studies are possible in this field.

在这个领域中，随机的研究是可能的。

We did not restrict to randomised controlled trials (RCTs).

不限制是否为随机对照试验。

Only randomised or controlled clinical trials were to be included.

只有包括随机或对照的临床试验。

Randomised trials "give you the chance to be surprised", Ms Duflo says.

随机试验“给了你吃惊的机会”，Duflo女士说。

We also excluded quasi-randomised trials and trials using a cross-over design.

我们也排除了半随机对照研究和使用交叉设计的试验。