This isn't a conclusion based simply on some cohort or case-control studies. There are many, many randomized controlled trials.

这一结论不只是基于一些世代研究或病例对照研究，而是基于无数随机对照试验。

youdao

The Vanderbilt AF Registry and German AF Network (AFNet) are case-control studies.

范德比特心房颤动注册表和德国房颤网均为病例对照研究。

youdao

Of the available studies, 29 were cohort studies, 69 case-control studies, and 4 randomized clinical trials.

现有的研究包括29个队列研究，69个病例对照研究以及4个随机临床试验。

youdao

In addition, case-control studies, such as the large INTERHEART study conducted in 52 countries, have provided valuable information.

FORBES: Do Smoking Bans Really Save Lives? If So, Whose?

The Danish study is prospective in nature, which distinguishes it from most other studies on the health effects of cell phone use, which were case-control studies and enrolled subjects diagnosed with brain tumors and a comparison group of subjects who were free of brain tumors in order to compare reported cell phone usage in the two groups.

FORBES: Do Cell Phones Cause Brain Cancer? The Diehards Cling Desperately To Opinion