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. 2021 Apr 21;8:637069. doi: 10.3389/fmed.2021.637069

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Copyright © 2021 Blundo, Cignoni, Banfi and Ciuti.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Summary received operating characteristics (SROC) curves which displays the results from the meta-analysis with indicators of quality assessed using QUADAS-2 (i.e., overall risk of bias and overall concern regarding applicability). The curves reported also the 95% Confidence region. Included studies were divided based on the employed technique: (A) RCM, (B) multispectral imaging, (C) spectroscopy, and (D) electrical measurement.