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.
方法本研究采用随机、双盲、平行对照的临床研究方法。
Methods A randomized double-blind parallel controlled clinical trial was conducted.
方法：本研究采用分层随机抽样方法和整群随机抽样方法。
Methods: The stratified sampling and cluster random sampling methods are used in this survey.
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