Study Design. Prospective, randomized, double-blind study.

研究设计：前瞻性、随机化、双盲研究。

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Methods: Randomized double blind study was employed.

方法：随机双盲对照临床研究。

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Methods: Randomized double blind study was employed.

方法：随机双盲对照临床研究。

youdao