It is commonly used to study outcomes in clinical trials.

New ways to prevent skin cancer are being studied in clinical trials.

New ways to screen for cancer are being studied in clinical trials.

Several of these substances have not been well studied in rigorous clinical trials.

Most supplements have not been studied extensively in large clinical trials.

New ways to help smokers quit are being studied in clinical trials.

This approach may become a treatment for some people with type 2 diabetes, but has not yet been studied in prospective clinical trials.

None of these suggested therapies have been studied in clinical trials.

The general acceptance of the treatment as effective may prevent it from being further studied in clinical trials.

New combinations of treatments are being studied in clinical trials.