Large sample, prospective, randomized controlled studies on treatment are scarce.

在治疗上还缺少大样本、前瞻性随机对照性研究。

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Two randomized controlled studies show that defibrillators do not benefit patients who just had a heart attack.

两组随机的受控对照研究表明，除颤器不能为刚好心脏病发作的患者带来好处。

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“Take patients who just had a heart attack,” Dr. Khatib said. “Two randomized controlled studies show that defibrillators do not benefit patients who just had a heart attack.

“选择刚好心脏病发作的患者，”哈提卜博士说。“两组随机的受控对照研究表明，除颤器不能为刚好心脏病发作的患者带来好处。”

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Many people enthusiastically tried the so-called Feingold Diet, but the enthusiasm waned as the years went on and "some very well-done randomized controlled studies" questioned Feingold's theory, says Deborah Pearson, Ph.

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These are the kinds of big, randomized, controlled studies that the U.S. Food and Drug Administration requires before a new drug is approved.

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That research, however, typically didn't involve randomized, controlled studies.

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