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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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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