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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As the authors state in their final sentence: “…further studies with large study populations, where the potential for misclassification of exposure and selection bias is minimized, are warranted.”

研究人员在报告中也表示：“我们正在准备更大规模、更进一步的调查研究，从而尽量避免错误归类的现象和选择上的偏误。”

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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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