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. 2021 Nov 17;23(11):e30042. doi: 10.2196/30042

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©Andreas Knapp, Lorenz Harst, Stefan Hager, Jochen Schmitt, Madlen Scheibe. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 17.11.2021.

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 the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on https://www.jmir.org/, as well as this copyright and license information must be included.

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Number of outcome measurement instruments collected per study. PREM: patient-reported experience measure; PROM: patient-reported outcome measure.