方法采取随机双盲对照临床研究。

Methods The random clinical study with double blind was used.

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方法：随机双盲对照临床研究。

Methods: Randomized double blind study was employed.

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方法：随机双盲对照临床研究。

METHODS: The double blind method was selected.

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设计病例对照临床研究。

Design Case-controlled clinical trial.

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研究目的：单盲，随机对照临床试验。

Study Design. A simple blind, random controlled clinical trial.

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研究目的：单盲，随机对照临床试验。

Study Design. A simple blind, random controlled clinical trial.

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