Since NHANES III was an observational study and not a clinical trial, no definite conclusions about cause and effect were possible, says Dr. Cohen.

科恩博士说：“NHANES III是一项观察上的研究而不是一次临床试验，所以，关于因果没有一个确定的结论是可能的。”

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We conducted a controlled clinical trial to define the effect of fusion on lumbar spine and patient-related functional outcomes.

我们组织一项控制性的临床实验来确定腰椎融合手术的作用以及与病人相关的功能结果。

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This is a beneficial hemodynamic effect of CGRP as a vasodilator for treating pulmonary hypertension. The clinical trial can be done on the basis of the study.

CGRP用来治疗肺高压显示出有益的血流动力学效应，据此可进行临床试验。

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Billie Piper is nominated for her role in clinical drugs trial drama The Effect, while the best actress category is completed by Hattie Morahan for A Doll's House and Kristin Scott Thomas for Old Times.

BBC: Theatre's Olivier Award winners to be announced

When Merck and Schering-Plough revealed Monday that the active ingredient in their top-selling cholesterol meds Zetia and Vytorin had flunked a clinical trial measuring its effect on artery plaque, they opened themselves up to a barrage of attacks.

FORBES: Magazine Article

Merck's (nyse: MRK - news - people ) decision is based on new three-year data from a clinical trial designed to test the effect of Vioxx on preventing colorectal polyps.

FORBES: Merck Withdraws Vioxx