Limitations of this study include reliance on recall of diet and URTI, possible misclassification of exposure because of the timing of data collection, and possible residual confounding.

本研究的局限性包括对饮食和URTI回忆的依赖、由于数据收集的限制所可能造成的对暴露的错误分类，以及可能残留的混杂因素。

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Limitations of this study include reliance on recall of diet and URTI, possible misclassification of exposure because of the timing of data collection, and possible residual confounding.

本研究的局限性包括对饮食和URTI回忆的依赖、由于数据收集的限制所可能造成的对暴露的错误分类，以及可能残留的混杂因素。

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