The authors acknowledged that the study was limited by its retrospective design, possible misclassification, and potential recall bias.

作者承认，这项研究受到了的追溯设计，可能的错误分类，和潜在的回忆偏差的限制。

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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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The researchers acknowledge study limitations, including possible selection bias, misclassification of race and inaccurate responses to questionnaires.

研究人员承认研究也有一定局限性，包括可能的选择偏倚、种族误判和不准确的调查问卷等。

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