Karlan, Appel, Duflo and Banerjee tackle that question through randomized control trials (RCTs).
But randomized controlled clinical trials also are used to prove benefit in big drug studies.
The treatment was common until a randomized controlled trial proved it was actually harming women.
Randomized studies of closure may come to an end, however, if the Amplatzer device is approved.
But surgery sometimes goes mainstream without ever being evaluated in a randomized, controlled trial.
It was not placebo-controlled, blinded, or randomized, which presents major methodological problems regardless of what happened.
Another Tor-based mixing service is Bitcoin Fog which charges between 1%-3% (randomized for obscurity).
There's also no proof from randomized trials that more frequent treatment saves lives or prevents hospitalizations.
They could have, at the very least, randomized in game entities in the maps.
With a randomized minimum wage, it would apply randomly to different states or counties.
But more recent randomized trials have failed to show a hint of this benefit.
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But larger, randomized trials open to the larger community hadn't been done, for logistical and cost reasons.
Patients who had hemodynamically significant lesions as assessed by FFR were then randomized to PCI or OMT.
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In a 28-week study of Alzheimer's patients, 250 were in a randomized trial to memantine or placebo.
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Obviously, these findings are hypothesis-generating only and will have to be tested in a prospective, randomized trial.
Medical research commonly employs three kinds of study designs: observational studies, randomized controlled trials (RCTs), and metaanalyses.
In the double-blind, randomized control trial, half the women got tenofovir gel and half got a placebo.
Both are randomized trials to test the effectiveness of Avastin against Lucentis in treating people with wet AMD.
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He currently is recruiting post-stroke patients for a randomized, controlled trial comparing error-type treatment to intensive treadmill training.
But the fall of Chatroulette may be a sign that the shine has worn off randomized video chat.
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Both projects were rigorous randomized trials, comparing kids who got pre-K benefits with a control group that didn't.
Also, much of the exploration will be randomized, with special dungeons appearing at random points throughout the world.
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Merck has started randomized Phase 2 trials in 240 patients in colon cancer.
It is because the government-funded trial was a placebo-controlled, double-blind, randomized controlled trial.
The RESPECT trial similarly randomized 980 patients to medical therapy or PFO closure.
Tiffany has made a mess of her relatively short, randomized life, and she doesn't have much insight into why.
Randomized trials are not always feasible and, in some situations, may be unethical.
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But a related Abbott drug, TriCor, failed to prove its benefits in a large randomized controlled clinical trial.
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On the other, there was concern regarding the lack of strong, well-executed randomized trial data of the target patient population.
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"The biggest mistake of ablation was that there wasn't a big randomized study when the technology came out, " he says.
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