Systematic reviews of non-randomized studies are as common as reviews of randomized controlled trials.

非随机对照试验的系统评价与随机对照试验的系统评价一样是普遍开展的。

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Of the 338 excluded articles, 151 were about treatment, 132 were non-randomized studies, and 55 were repetitive studies.

排除的338篇文章中151篇为治疗方面的文章，132篇为未随机研究，55篇为重复性研究。

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Indeed, there are a number of small non randomized studies published on bone marrow therapy to promote liver regeneration from a number of groups around the world.

事实上，全世界已有多个小组发表了一些小型非随机研究，结果显示骨髓治疗可用于促进肝脏再生。

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