A randomized trial can be constituted-of-or-filled-with some (cancer patients).
A randomized trial can be constituted-of-or-filled-with surgery.
A randomized clinical trial may find that something-is-the-case.
Results can be constituted-of-or-filled-with randomized clinical trials.
Some randomized trials may demonstrate that something-is-the-case.
Reports can be constituted-of-or-filled-with randomized clinical trials.