We appreciate the comments by Zheng et al.[1] regarding our manuscript entitled “Cerebrospinal and blood levels of amino acids as potential biomarkers for Parkinson's Disease: review and metaanalysis”[2], emphasizing the heterogeneity across studies, a concern that was already mentioned in our manuscript.

中文翻译：

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作为帕金森病潜在生物标志物的脑脊髓和血液氨基酸水平：综述和荟萃分析

我们感谢郑等人的评论。 [1] 关于我们题为“作为帕金森病潜在生物标志物的脑脊髓和血液氨基酸水平：综述和荟萃分析”[2] 的手稿，强调了研究之间的异质性，我们的手稿中已经提到了这一问题。