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. 2024 Jan 2;24:1. doi: 10.1186/s12903-023-03624-5

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Fig. 3 — A Low risk of bias: studies that met at least four of the criteria; B Moderate risk of bias: studies that met between two and four of the criteria and C High risk of bias: studies that met less than two criteria. (Green-Yes; Red-No; Yellow-Unclear)