They were matched with a "control", teenagers of the same background who were otherwise healthy.

研究人员把这些患者与另一个相同年龄层的健康“控制组”做比较。

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They were matched with a "control", teenagers of the same background who were otherwise healthy.

研究人员把这些患者与另一个相同年龄层的健康“控制组”做比较。

youdao