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. 2023 Jan 11;7:e42158. doi: 10.2196/42158

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©Milena Foerster, Lucas Dufour, Wolfgang Bäumler, Ines Schreiver, Marcel Goldberg, Marie Zins, Khaled Ezzedine, Joachim Schüz. Originally published in JMIR Formative Research (https://formative.jmir.org), 11.01.2023.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Formative Research, is properly cited. The complete bibliographic information, a link to the original publication on https://formative.jmir.org, as well as this copyright and license information must be included.

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Scatterplot of assigned ranks of self-assessment versus validation data of total tattoo surface for 3 different measurement units using data from the whole study population (N=97).