. 2020 Dec 11;22(12):e24514. doi: 10.2196/24514
©Nadja Grammes, Dominic Millenaar, Tobias Fehlmann, Fabian Kern, Michael Böhm, Felix Mahfoud, Andreas Keller. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 11.12.2020.
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 http://www.jmir.org/, as well as this copyright and license information must be included.
Figure 1.
Publications included in the study. Bubble size reflects the number of instances of each item class.