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. 2020 Jun 12;123(4):673–688. doi: 10.1038/s41416-020-0928-1

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© The Author(s), under exclusive licence to Cancer Research UK 2020

Note This work is published under the standard license to publish agreement. After 12 months the work will become freely available and the license terms will switch to a Creative Commons Attribution 4.0 International (CC BY 4.0).

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Fig. 1 — Twenty-one studies with quantitative synthesis were included for systematic review and 13 studies with complete diagnostic results were included for conducting meta-analysis.