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. 2023 Aug 31;13(9):1847. doi: 10.3390/life13091847

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Traffic light chart for risk of bias analysis for cross-sectional studies (A) [11,12,16,18,19], case-control studies (B) [9,10,14,22,25], and cohort studies (C) [8,13,15,17,20,21,23,24].