A randomized controlled trial can be at some (community health centers).
A randomized controlled trial can be constituted-of-or-filled-with screening.
Randomized trials can be constituted-of-or-filled-with supplements.
Innovations can be in a design of randomized controlled trials.
Some randomized clinical trials may demonstrate that something-is-the-case.
Randomized trials can be constituted-of-or-filled-with protocols.