But it cautions that large well-designed studies are still needed.

But more well-designed studies are needed to learn their beneficial effects on humans.

Five of six well-designed studies showed that regular exercise could significantly reduce blood pressure.

Well-designed, thorough studies are necessary to give a clear picture of safety and effectiveness before making drugs available to the public.

Few well-designed experimental studies have examined the effects of weather changes on pain.

In a review of 14 well-designed studies, 6 showed that zinc helped; the others said it didn't.

But well-designed studies like these contribute greatly to what we know about empathy in other animals.

Well-designed studies have found interpersonal and social rhythm therapy to be ineffective.

Well-designed studies of hormone replacement for normal, healthy aging men are just getting under way.

Well-designed studies are needed to prove, or disprove, the value of a remedy.