Methods Case control study.

方法断面对照研究。

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Methods Case control study and self-control study in Chinese herbal treatment group were conducted.

方法采用病例对照研究和中药治疗组自身前后对照研究。

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Methods a community based case control study was designed.

方法以社区为基础的病例对照研究。

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Methods a community based case control study was designed.

方法以社区为基础的病例对照研究。

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