Otherwise, statisticians say only strict clinical trials with a control group and a test group and one variable can truly prove a cause-and-effect association.
否则，统计学家表示只有进行严格的临床试验，对比一个控制组、一个测试组以及一个变量，才能真正证明因果关系。
CONCLUSION: Scientific and strict clinical trials of drugs are helpful to obtain actual and reliable research results.
结论：科学、严谨的药物临床试验设计，有助于获得真实、可靠的研究结果。
CONCLUSION: Scientific and strict clinical trials of drugs are helpful to obtain actual and reliable research results.
结论：科学、严谨的药物临床试验设计，有助于获得真实、可靠的研究结果。
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