Randomized controlled trials of an intervention may be needed.
A randomized clinical trial may reveal that something-is-the-case.
Randomized trials can be on effects of neuromuscular agents.
A randomized controlled trial can be constituted-of-or-filled-with some infants.
Randomized controlled trials can be constituted-of-or-filled-with steroids.
A randomized controlled trial may involve addition of heparin.
Some randomized controlled trials can be constituted-of-or-filled-with (jet ventilation).
Some randomized controlled trials of (jet ventilation) may be included in a systematic review.
Randomized controlled trials can be constituted-of-or-filled-with (corticosteroid therapy).