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Study Design: Randomized, controlled trial; Level of evidence, 1.
研究设计：随机对照研究； 循证医学级别，1级。
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The first level of treatment is a trial of a low-fat diet and exercise.
第一级的待遇是一个审判的低脂肪饮食和运动。
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The first level of treatment is a trial of a low-fat diet and exercise.
第一级的待遇是一个审判的低脂肪饮食和运动。
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