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. 2022 Nov 18;10:1002696. doi: 10.3389/fped.2022.1002696

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© 2022 Ossendorff, Placzek, Bornemann and Walter.

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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Overview of systematic evaluation of the original articles used by Sakkers et al. (3). 10 articles included sonograms, only 5 articles fulfilled the quality criteria according to Graf.