Study Design. A simple blind, random controlled clinical trial.
研究目的：单盲，随机对照临床试验。
The most common designs in clinical trial are parallel design and cross over design.
临床试验中最常见的设计是平行组设计和交叉设计。
Design non-randomized clinical trial.
设计非随机化临床试验。
Design Case-controlled clinical trial.
设计病例对照临床研究。
Design Case-controlled clinical trial.
设计病例对照临床研究。
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