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

研究目的：单盲，随机对照临床试验。

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Methods The multicenter, double-blind, random samples, active-controlled study has been processed in the mild to moderate hypertensive patients, and maleic acid amlodipine as the controll drug.

方法以国产马来酸氨氯地平为对照药，在轻度至中度高血压病人中进行多中心、随机、双盲、平行、活性对照的临床试验。

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It is a randomized controlled study, meaning that similar patients were assigned at random to either get either Centrum or placebo.

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