two study design
二项研究设计
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In a type of study design known as a crossover, patients received their allotted pill (either Ampyra or placebo) for two weeks twice daily, then all switched to placebo.
FORBES: Drug That Helps Multiple Sclerosis Patients Walk May Also Aid Stroke Victims
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