DESIGN Randomized control experiment and single blind method.

随机对照实验，单盲法评估。

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Method: Adopt the random single blind prospective method in clinic research.

方法：采用随机、单盲、前瞻性的临床研究方法。

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Method: Adopt the random single blind prospective method in clinic research.

方法：采用随机、单盲、前瞻性的临床研究方法。

youdao