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. 2020 Dec 31;10(12):e038489. doi: 10.1136/bmjopen-2020-038489

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Assessment of methodological quality of included studies using the QUADAS-2 Criteria. Stacked bars represent the proportion of studies with a high (red), or unclear (yellow) or low (green) risk of bias and applicability concerns. QUADAS-2, Quality Assessment of Diagnostic Accuracy Studies-2 criteria.