Methods: The study was designed as a randomized, double blind, double dummy and multi-center.

方法：随机、双盲、双模拟、多种心研究方法。

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Methods This is a randomized, double blind, double-dummy, multi-center, parallel positive controlled clinical study.

方法用随机化、双盲、双模拟、多中心、阳性药平行对照研究方法。

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