Helminthic therapy may be shown in a randomized (control trial).
Some review can be constituted-of-or-filled-with randomized controlled trials.
Results of randomized trials may suggest that something-is-the-case.
A randomized clinical trial may demonstrate that something-is-the-case.
Some randomized controlled trials can be in a scientific literature.
A meta-analysis can be by a collaboration of some randomized controlled trials.
Randomized controlled trials may indicate that something-is-the-case.