方法：采用随机双盲、平行对照临床试验方法。
Methods: A randomized, placebo contmlled, double blind trial was used.
方法：本研究采用随机、对照、单盲临床试验方法。
Method: the research used the random contrast and single-blinded test.
方法采取平行组设计、分层随机、双盲、多中心临床试验方法。
Methods parallel group, stratified randomization, double blinded, muti-center clinical trail was designed.
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