Methods Case-controlled research.

研究方法病例对照研究。

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Design Case-controlled clinical trial.

设计病例对照临床研究。

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DESIGN: Single factor analysis of variance (a case-controlled study) SETTING: Laboratory of nutrition and metabolism diseases in a university.

设计：单因素方差分析(分组对照实验)。单位：一所大学的营养与代谢性疾病实验室。

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